Seems like what beth will probably do is have the current empire collapse after Mede II's death and the dragonborn, with the support of Tullius reforms the empire.
Or. The empire collapses, Dragonborn with the support of Ulfric reforms a new empire.
Or. The empire collapses, Dragonborn with the support of Ulfric reforms a new empire.
Based on past games, who "wins" won't matter or be talked about. The only question will be whether the Empire continues to exist or not.

