This is the wrong thread to ask this... but did someone really asked himself what Beth will do with the situation? I mean our personal preferences put aside for the moment... and the fact, that of course everyone has asked himself that question... but I want to hear your opinions, anyways.
Nobody will "powerplay" and take over everything alone. I even doubt an alliance will win....
2 options in my book:
The/an Empire will be restored somehow, uniting Tamriel
or
The fragmentation of the Empire comes full cycle. There may be another war, but the factions will come to a stalemate. Maybe the Thalmor will be disbanded, but without destroying the Summerset Isles or even the Dominion necessarily. Only the extremists.
Maybe we can discuss this further in this thread.
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I could get behind that. The Altmer are naturally isolationist, so if the extremists are taken out of power I expect them to leave everyone else alone.
Actually, the Thalmor are a strange thing. To undo creation is new to the Altmer. It's an idea born out of necessity.
The Tower of Crystal-Like-Law connected them to Aetherius and to Auri-El, the Aedra who tought them Dracochrysalis, the way to leave the Mundus again, without destroying it.
During the Oblivion Crisis, the Tower was destroyed, the connection between the Altmer and their Lord severed.
The Thalmor are, on a metaphysical level, the direct conequence of this. They see no other chance for salvation than to undo reality, because Crystal-Like-Law is no more, the mythic spine of their people.
Maybe the next game sees a return to the old ways of Dracochrysalis, an Altmeri Chosen One, recreating the Crystal-Like-Law or something comparable.