For that to happen, you'd have to, uhh... *ahem* "remove" the previous emperor.
I dunno why people keep thinking the Dovahkiin can, will or must revive the CYRODILLIC empire. Talos of Atmora was a
Nord who led his forces to conquer tamriel - he didn't represent anyone else established faction, he forged his own.
There is plenty of reasons both canonical, chronological, long term lore, and in terms of content requirements if the Dovahkiin forged a new empire from scratch. Throw in the whole "mantling" thing and even the Dovahkiin's race wouldn't matter because ultimately they will be
mankind's protector and take on Talos' visage, like CoC took on Sheogorath's.