The Trespasser DLC has me in my feelings, and I've still yet to romance Solas. There should have been a "hug solas" option for an Inquisitor who was his nerd buddy and missed him after he vanished for like, 2 years. At any rate, a Solasmancing playthrough has been on my to-do list for a while, then it came off my list when I saw how he ditched Inqy at the end of vanilla DAI, then it went back on when I saw he was gonna be in Trespasser, and now after the ending I'm not sure I wanna go through with it T_T But it definitely seems like something I want for my canon Inquisitor, so...
On an unrelated note, I've been wondering if Solas might be fulfilling that whole "unreliable narrator" trope, considering his close personal (lover? mother-son?) relationship with Mythal compared to the other Evanuris, not to mention having her essence in him now. Like, of course he'd view her/she'd view herself as "the best of the Elven Gods". Since DA as a whole seems to be big on gray & grey morality, I'd find it interesting if when(?) Solas strikes down the Veil and brings the trapped Gods back, if they have a very different view of Mythal than Solas presented to us. Which is not to say I don't like the character, Flemythal has been one of my favorites since DA:O/The Stolen Throne.
I'm too lazy to quote individual posts, but I think this is mainly @Brass and someone else:
1) I definitely agree that it's feasible whoever drank from the Well, either of whom are extremely powerful mages/characters with access to magic (in the case of a non-mage Inqy) will wind up tearing the Veil if Solas doesn't do it. After all, it seems Solas and Mythal were in on this together, and Flemeth (in her own words) was planning on "a reckoning" (DA2?) and "revenge". Does she want to bring the Elven Gods back to kill them once and for all? Either way, we have an EXTREMELY powerful and knowledgeable (Morrigan) or less powerful due to the loss of a hand but EXTREMELY well-connected (Inq) character walking around Thedas as effectively Mythal's pawn. Even if she herself is completely dead and we defeat Solas, the voices of the well will likely carry out her will regardless.
2) I actually don't think Solas' plan will kill all the Elves (perhaps not even all of the other races?) It will cause tremendous devastation and probably kill MOST of the world's population, but there will be some survivors. This is, of course, assuming the effect of striking down the veil will be similar to the effect of creating it in the first place. When Solas created it, there were of course, some elves who survived, otherwise how could they exist in modern day Thedas? It's not like Solas repopulated the world himself. Furthermore, the Ancient Elves in the Temple of Mythal also survived, so... yeah. That doesn't excuse what he will do, but I don't think EVERYONE will die. I'm assuming most will, but the ones (primarily/solely elves) who survive will have their long lifespans restored.
Unless the Ancient Elves (sans Abelas & co) were also trapped for centuries in the fade with the Elven Gods, and his plan is to bring THEM back and kill the current world. I guess I'm not clear on if that is his plan, or his plan was to restore the old way of life to the current elves (which is what I assumed). If the former is his plan, poor him, he will NEVER be anything less than a villain (as I'm sure they won't be too pleased, having been trapped in another plane for 1000+ years).