both the alik’r and black marsh ((seriously, argonia? do you even lore bro?))
are largely independent of the empire even during the reign of the septim dynasty, and both would be very interesting subjects of the next game, espectially in the 4th era timeline, as the government of the alik’r has won battles and secured indendence from the empire and dominion, on the other hand, black marsh is largly unexplored even to the 4th era, it being far to treacherous to mount any substantial form of conquest, even tiber septim just conqured the outlying regions and left the heart of it alone.

in conclusion, whichever province it takes place in, im kool with it

In my experience with TES games, which is from Morrowind and up to TESO, the word “Argonia” have not been used much. The only times was when the history of the area now known as Black Marsh was being told. (as Argonia was the name it had before a longer series of events) In other words the word “Argonia” is uncommon to most TES players, and I think Bethesda qre well-aware of this. Unless the setting is way back in time, even before the events of TESO (which is 1.000 years BEFORE Skyrim), Argonia seems a highly unlikely title for the next game. As for Redguard, I can better see that working as a title, also because the largely independant Hammerfell is an interesting story, we get a snag of it with Saadra in Whiterun in Skyrim. But again, “Hammerfell” (which sounds like a Mastodon-esque 80’s metal band) is a title with more power and more recognition amongst TES-players.

My personal hope is either for Elsweyr or for the Summerset Ilses. The Summerset Ilses are obvious, as this is the root of the Thalmor, which was one of the main points in Skyrim. As for Elsweyr, there is plenty of tention between the poor, but highly populated north desert (Pelletine) and the rich, but rather less populated south jungles (Anequina).