If this is so, and mortals are able to transcend, much like the myth of the human Arkay, is it also possible for Aedra to separate themselves from Mundas and return to their Daedric origins? This seems to be the case in Boethiah's corruption of the Aedroth Trinimac, forming Malacath. (Also, see Meridia.)
For me, it doesn't seem much of a jump to go between the two, considering we've had two confirmed cases of mortals transcending into Daedra: Umaril and Sheogorath. If the Thalmor are so obsessed with immortality and power, it's surprising they haven't considered this route. I suppose one argument might be that, since Daedra bear the curse of extremes/obsession, they are certainly less "human" than the Aedra, and that the Thalmor demand immortality and immutability--the stasis of personality that defines the Divines. In all likelihood, however, they'll probably go the way of the Dwemer...
Feedback is greatly appreciated.