I saw a theory on tumblr I was really digging for the whole rebirth scenario, but I'm unsure If I can find it..
Here It is. It seems plausible enough, atleast to me. But we all have our own Headcanon/theories of course.
http://spectreoftheg...uture-isnt-real
Wow. Of all the "tinfoil hat" theories I've seen trying to discern Solas' motivation, this one seems the most spot-on. It fits with the conext of the universe, because we see words and actions similar to it. It also fits with how BioWare likes to present major conflicts. We see a small version in one game, and then it escalates in the next game, or a similar but bigger conflict shows up.
For example, the Blight. The first game, darkspawn are mindless monsters until an Archdemon awakens them. Then DAA came, and suddenly there are intelligent darkspawn, and we learn the Archdemon was awakened by one of them. Even if you kill the Architect, it's implied (and not outside the realm of possibility) that some of his lackeys survived and are out there.
DAO, the Broken Circle quest. Tensions between Circle mages and Templars erupting into an explosion of blood mages, abominations, and Annulment. However, it's all contained in a Circle Tower. DA2 comes around, and the same tensions and erruptions blow up over a whole city, then spreads over the whole world.
Corypheus: the villain of a relatively small DLC - one of the magisters that created the Blight, who wakes feeling confused and disoriented and lost since the world he remembers was Ancient Tevinter at the height of its power. DAI rolls around, and he's the Big Bad of a massive MMO world conflict, seeks to tear open the fabric of reality, ascend the heavens as a god, and recreate the mighty Tevinter Imperium that he remembers. And his whole "Archdemons can't be killed because their souls jump into the body of the nearest blighted creature" is played much more scarily and dramatically than previous games.
Likewise, this game introduces the concept of time travel. The PC is thrust forward into a future so awful that letting it stay this way doesn't feel like an option. The time-jumpers feel this world "isn't real," it's just a hypothetical that must be prevented from happening. But to those inside it, it is real. Except for Solas, who immediately guesses and jumps on board with the whole "Go back and prevent this from happening!" And he'd be in the best position to know this could happen, since it was his Orb. I wouldn't be surprised if this was subtle foreshadowing of what Solas will do next game, or the one after that. To him, all of Thedas is such a horrible future (compared to the time he lived in) that it must be reversed... even if he's fallen in love with someone here.
Dang. While I still want Solas and Lavellan to have a proper reunion and closure, I don't think she could help him erase untold millennia. =/