I, for one, hope the Empire gets dissolved in the lore. It would make things infinitely more interesting.
Or at least goes the same way as the Roman Empire and becomes something akin to the Byzantine empire.
The way I see it Morrowind and Oblivion were TES in the classical age, now it is moving into the Dark Ages,
So if previously (and this is superficial/politically wise, not lorewise):
Skyrim = Celts/Germanic/Goth tribes
High Rock = Gaulish/Helvetica tribes
Hammerfell = Turks/Moorish tribes
Elsweyr = Moors/Egyptians(?)
Black Marsh = Aztec/Inca tribes
Morrowind = Persian/Akkadian tribes
Imperials = Roman empire
Summerset Isle = Babylonian/Lothlorien
Orsinium = Mongols/Timurids
Solstheim = New Zealand (

)
In future games they will probably be more like this
Skyrim = Holy Roman Empire/Switzerland
High Rock = France/England
Hammerfell = Moors/Ottoman Empire
Elsweyr = Egyptians (in their Medieval, Dark age situation)
Black Marsh = Still Aztec and Inca
Morrowind = Jewish tribes/Afghan tribes
Imperials = Byzantine/Greek empires
Summerset Isle = Third Reich (they don't really have a real world counterpart for the dark ages
Orsinium = Mongolia