While I think Solas' plans are important, I think learning Mythal's plans are most pressing. I think she is the one who will actually shake the Thedas. Solas' plans must align with hers or else she probably wouldn't help him. The plans may possibly lay the foundation for what she intends to do. I sense it will be live changing and exciting, but in all likelihood most Theodosians will see it as the world ending. So much fun (for us)!
I'm totally gonna call it here (along with a few others) and say there's going to be a plan that will involve the Veil and the Fade. Possibly rip the Veil from the sky? The Fade and Thedas will be one again. Omg, I see SO much going wrong if that were to happen. How could anyone think that would be a good idea unless they wanted to ensure chaos. That can't be what Solas would do. But it does fufill the prophecy Sandal predicted. I wonder if that could be Flemeth's goal?
Solas' goal couldn't actually be to revive the elven gods, that would accomplish nothing. He talks about how the relished in their power ... What if he instead wants to show the People he is a god. Then the Dalish would listen to what he has to say if he could prove his status. The elves would recover their lore. He could possibly rebuild.
But Cole's banter ... he did say "They sleep, masked in a mirror, hiding, hurting, and to wake them..." so that would leave anyone to believe he wants to wake them again...
Okay "They sleep, masked in a mirror, hiding, hurting, and to wake them...", what if the Old Gods and the Elvhen pantheon are linked (I hate to thinking so). And suppose some of the eluvians led underground to where a single elven god slept. Tamlen and possibly the Warden did find a corrupted eluvian that showed Tamlen a city underground. What if that was a cry from the elven god to come free them? What if the Old Gods are already corrupted and when the darkspawn get to them they are simply woken up? Solas does say he knows of no connection between the Old Gods and the pantheon, but that just means he never learned of what happened after he banished them.
It's insane and out there, but something I only thought of only because of Cole's sentence. This however doesn't even begin to link the humans Chantry version about the magisters.... but in Origins there was an underground ruin that had both human and elven artifacts. Could the humans have originally worshiped the elven gods? After a time what if the human sects began to form and changed their worship? Humans didn't appear until around -3100 Ancient. In -2850 Ancient elves began to withdraw from human contact. For 250 years they may have worshiped the elven gods. But in -2800 Ancient the Old Gods began their whispers...
Argh! Theorizing is hard. So many holes to be mended.
edit: Was watching a theory from someone else and they mentioned the Forgotten Ones! I completely forgot about them! We're to believe they reside in the Void. So could it have been the Forgotten Ones in -2800 Ancient that whispered to the Tevinters? Their whole reason for whispering could be to bring harm to the elven gods.
But then would you have to assume if that were to be true that the black city is actually Arlathan? And that Solas banished a chunk of the city to the Fade? But then what explaination would there be for the magisters corrupting... Unless the magister's were used by the Forgotten Ones to spread the blight to Thedas. The only way to connect these theories is that when the magister's reached the black city and were thrown out, the 7 things that fell from the heavens were actually the elven gods. But then how would a mirror get incorporated ... Sigh