The Blanketfort (crying and throwing up) - The Official Solas Thread [Spoilers]

I suppose that is a possibility. After all, the one thing you can't do is kill him. On the willingly sacrifices himself without Lavellan being there ending, he says something about protecting the innocent in the future (I think). So, given the "secret" ending teases the Executors as the antagonists next game and he warned against them in Tevinter Nights, it is possible that he could speak to the next protagonist from the Fade to assist them. He'd probably do that however things ended with Rook because if Solas doesn't like someone he feels compelled to act against them. May be he is now the replacement Varric in the franchise.

Incidentally, did anyone in world suggest that perhaps he was the "Maker" who spoke to Andraste?   I know they commented how she got it wrong but that was about it really when it came to the main religion of Thedas.    Since they pretty much admitted the Maker doesn't exist, Solas does make the ideal candidate for the one who spoke with Andraste, the other being one of Mythal's pieces.   Obviously they would appear to have had different motives for wanting to attack the Imperium but I do not doubt that both wanted her to conquer Minrathous.