I've pretty much skipped the last couple of pages on account of i'm pretty sure i read everything that was said a few pages ago.
People need to understand that everyone here is talking out of perspective and personal feelings and without the powers that be swooping in and spilling all, we will never know. Well, we won;t know for a while, anyway.
I'm with the people who believe there could be more the Inquisitor could do. And i would prefer it that way. After the ambiguous ending of the base game, having a new PC would have been fine, even with the little scene with Solas and Flemeth. At that point my Inquisitor would not have known who Solas was and what he planned to do. Someone new could have easily slipped into that spot. But now she does, and she's vowed to stop him. Even my Inquisitors that were neutral/hated Solas vowed to stop him. They just finished watching some potential effects of the Veil disappearing, i can't fathom a good reason for them to retire into relative obscurity. And i would not be happy with them being an NPC because Hawke's appearance made very few happy, and angered the rest. From the way they looked to the way they acted, people were not satisfied. We can all but be certain we will see the Inquisitor again, because no one knows Solas in the same way they do. You see different facets of his personality depending on your relationship with him, and that information is important. Anyone could stop Solas but it will come down to
1) I will stop Solas and kill him/save him from himself (Inquisitor)
2) I'm going to save the world from the crazy elf because someone has to do it (New PC)
Both could work, but 1 gives stronger character motivation. Those of us who prefer one see how much more personal that story would be. New players would be at something of a disadvantage, but they won't be excluded. And i always have to wonder why people play later games first, but if they choose to do that then they should expect some amount of confusion.
As a long winded show of how connections helps, i wonder who else was confused and excited about Solas being the Dread Wolf. I played a Dalish in Origins, and Merrill in DA2 was good insight into how closed minded some Dalish can be. So when Solas came in and told my Inquisitor everything she ever knew about the Gods is wrong, i, as the player, was really excited and intrigued. I thought i knew everything about the Elven lore, and knew it wasn't completely true because of various Codex. To meet someone i'd read a lot about, only to be told everything i knew was wrong made me so excited in itself to see where the story goes. People who haven't played the first two games or ignored Codex would not have had that same moment. For me, the resolution with Solas happening with the Inquisitor will give me that same level of satisfaction. Sure a new PC could easily fit the slot, but a lot would be missed and the only reason i can see that is a convincing argument for the new PC is "it's a thing now". "They're a cripple" would actually be deeply offending, and i would outright reject it as a concrete reason. I don't think Bioware is disgusting enough to use the lack of an arm as a reason to not have the Inquisitor back. The only other reason would be "Solas knows them", but the Inquisitor also knows Solas and has an outright effect on how he is as he sets his plans into motion. If he is neutral or hates you, he's more set on his goals than ever. If he respects or loves you, he is deeply conflicted by his actions, though still committed to them. Without using yet another big part of a game to get to know him, a new PC does not have this connection. As such i think that reason is shaky. Leaving "it's a thing now" as the only remaining argument, but what's the point in doing that if the story would be stronger with the Inquisitor fighting Solas. I mean, i want to be a Tevinter and see that place and that life through their eyes, but not while Solas is still running around. The only interesting thing a new PC could get out of this for me is 1) they are a magister and 2) they find out they are not a mighty nation built upon strength, but scavengers stealing from a corpse. And the Inquisitor has some entanglement with the Qunari, including the knowledge they plan to invade the South after they saw the Breach, Yet another reason they would not just sit back and wait for stuff to happen.
I interpret the line "Then we'll find people he doesn't know" to mean companions. Granted, i know that's more of a hope than anything else.
So far there is 1 thing we do know. Solas' story will conclude in DA4, as Weekes so helpfully told us. Some of us want the Inquisitor to come back and finish what they started, so a new PC can come and do some awesome stuff. Solas pretty much challenges the Inquisitor to stop him, i would rather not play as the Inquisitor's scapegoat. People thought Morrigan's OGB would be a big plot point, but it wasn't (made sense given he may not even exist). People thought the Mage/Templar war would be the main part of DAI, it wasn't. And was mostly found to be unsatisfactory. If they downplay Solas' role with what they have set up in Trespasser, i'm going to have to start questioning if they know what they're doing. The established a connection between the Inquisitor and Solas (some people seem like they haven't picked up on that), Solas challenges the Inquisitor (I would treasure the chance to be wrong again my friend or I know you will try [to stop me]), the Inquisitor does know his tactics. But as well as this, Solas hates the Qun. He would most likely HELP prevent an invasion again, from the shadows.
Just as a new PC can come in from the side lines and stop Solas, the Inquisitor can go to Tevinter and fight against the Qunari....and i bet make Dorian Archon. I'm pretty sure Weekes also said we won't be building up another massive power, which the Inquisitor wouldn't do given they know how Solas works.
This ended up long winded and i probably wanted to say more, but this circular argument is getting very tiresome. Just as those who don't want the Inquisitor back are not convinced by what we say, i have yet to see any sort of argument for a new PC that makes me think it could even be a slightly good idea. If the Inquisitor is not the PC of the next game, i will begrudgingly buy it. If i feel that something was lost because they put in a new PC "because we did" then i may not be able to buy another game from them. Only time will tell.