But since we have been given the hint from Weekes that Solas' story will conclude in the next DA (assuming there is one, as he said)
But you raise interesting ideas.
The Qunari have been an "imminent threat" since Origins, though. But i would vastly prefer to be a Tevinter PC to deal with that mess.
But just to touch upon the involvement with the Inquisition aspect you think of. Most people hated being an agent of the Inquisition in Inquisition, so i wonder why there are people who want to use that in the next game. How would you see such a thing working?
Ah, I hadn't heard about that tweet from Weekes, It would really depend on where the story goes (for whether or not the Inquisitor is the PC in the next game or not). After Trespasser i envisioned a rough idea of where the overall story may be going, i assumed - given the highly likely connection between the blights and the Elven 'gods' - that the Dragon age endgame would involve the Elven Gods getting out (though somehow without tearing down the veil and killing everyone), and the final 2 Archdemons rising. We'd leave the series having defeated the blights once and for all, and having defeated the manacle Evenuris, thus wrapping up most of the plot threads that they've been building since Origins. I assumed this rough structure would play out over the next 2 or 3 games (6 games feels like a good number to end the series on).
If this were the case, it would seem fitting for Solas' fate to be resolved in the final game with him helping defeat the Evenuris in the final game, OR for him to die releasing the Evenuris in the penultimate game, be it 4 or 5 (we'd then deal with the Evenuris in the final game). Personally i can't see him going out any other way. If we're able to stop him releasing the gods, we'd need to go about killing them, otherwise it would be an incredible anti-climax, they'd still be waiting and the issue would really be resolved. If this were the case for the 4th game out of 5, then i guess i'd be happier to have the Inq as the PC, but then that would still leave the final game for the Evenuris to be defeated - and as i can't see Bioware doing 3 DA games with the same PC - then it would likely be a new PC, and that would just feel bizarre, having a totally new character take on ancient gods (unless it was the warden......but nevertheless the Inq still has the greatest personal connection to the Evenuris story line and would be the most fitting character to resolve it. Which is why i'd love to have a duel protagonist system with the Warden and the Inq for the final game, if we're dealing with the gods and the Archdemons that is)
I know i'm debating the plot structure of an entirely made up idea of what the future games will be like - and i'm likely 95% wrong about it all - but that's what i'm basing my feelings off of, in regards to the 'new PC or not' issue.
If i were correct and we're looking at a 6 game series overall, and the next game will be roughly the ideas i suggested in the previous post (qun war, Tevinter politics, grey warden civil war, Solas in the background etc. ) and just above about the endgame of the series, then i'd say it's the logical time to deal with the Qunari threat they've been building up for the last 3 games, seeing as (in my scenario) the final game would deal with the Evenuris, Solas, The Titans and the final Archdemons, then throwing in a full on Qunari invasion would just make the whole thing overstuffed. Admittedly it could happen in the 5th game, if we are to have 6, but the next game is almost certainly going to take place in Tevinter+ The Anderfells (given the stabbing off it on the map at the end of trespasser, the new Magekiller comic, Hawke going to Weisshaupt, hints at a growing Warden civil war. and the fact that so many fans have been begging to visit Tevinter for years now), the prelude to their new invasion in Trespasser, and the fact that the slides after Trespasser say the Qunari launched a new aggressive attack on Tevinter that could threaten the rest of Thedas, and so it would seem the most likely time for us to resolve the Qunari threat once and for all rather than spend another game building it. And i agree with you, i would much prefer a Tevinter PC for the 4th game (provided we resolve Solas and the Evenuris with the Inq, though if that if happening in the 4th game then i'd say that a Inq PC takes precedence given the larger story).
And finally, when i said 'we could operate as an agent of the Inquisition' in the next game, i didn't mean to imply i wanted that to be the case, more that i could see that being a way to thrust the new PC into the larger story, as - disbanded or not - the inquisition is heading to Tevinter, and the Inquisitor even says at the end that as Solas knows all their agents and methods, that they'll need to get new ones to go after him. I took this as foreshadowing for the next protagonists role, they'll be contacted by the Inquisition and get involved in the overall story, then you as the player could choose whether to go it alone with your followers or to work with the Inquisition.
Many apologies for my overuse of brackets, and if structurally this is a bit all over the place, it's very early and i have yet to have my morning coffee 