One thing that astonishes me about Fen'Harel's plans is this apparent desire of his to free his fellow Elven deities.
I don't know but that seems foolish. Firstly, if Fen'Harel's portrayal of them is correct, then the ancient Elven deities are an extreme version of the Lannisters and Littlefinger from Game of Thrones. They are cruel, vain, greedy, etc and that was during their peak. What do you think these deities will feel now when they awaken ?
Wouldn't they get really very angry and kill Fen'Harel ? Wouldn't they be very angry at the state of the world, like Corypheus did and wage a massive war ? Wouldn't they be then subsequently destroyed (because if Elven gods decided to go to war, you can be sure that Humans, Qunari and Dwarves will ally with each other), resulting in the total annihilation of Elven culture ?
Well, that's assuming that anything in the lore is actually correct, while we have good enough to believe that large chunks of it aren't. I mean, if you choose to believe that Abelas tells the truth, then Fen'Harel had nothing to do with Mythal's murder - and ancient elven lore neither mentions Dread Wolf's lack of involvement or the fact that Mythal was, in fact, slain.
Then there's also a possibility that, no matter how bad gods are, they hold the key to saving the world, or elves, or whatever there is Solas thinks it's worth saving. Might as well just be like in case of bad Quizzy - not really someone you want to lead Inquisition or maybe even alive, but him/her having the Anchor may be the key of solving a particularly dire problem.
And there's yet another possibility - that Solas doesn't plan to release the gods, but someone else altogether (or maybe not all of them).
Personally, the best way forward is for the Elves to live in seclusion, in remote corners, slowly rebuilding themselves up first before attempting anything else. That would be the most logical thing to do. Nevertheless, I get the idea that ancient Elven gods are not very logical or sensible.
Um, Solas does hint to Abelas that there indeed exist elvhen colonies somewhere. Question is whether they've tried to rebuild their life, but failed, due to lacking something crucial, or perhaps realizing that they can't do it on their own. Who knows?