I seriously doubt that will happen.
Just the existence of the Baldurian tag implies that there will be other tags upon full release.
Well ...
I dont think its impossible tho.
As long as Writers in Larian keep in mind that some player DONT want to be from Baldur's Gate for some reason ...
All they need to do is hide any conversation related to being from the city under tagged option.
Simmilar as they did at Waukeen's Rest ...
Your human can either say: "Grand Duke? Who is that?"
Or: [Baldurian] "Yeah i heard about him."
If picking the non-taged conversation starts the same part conversation as Drow, Gith and other non-Baldurians see ... instead the Baldurian one ... you should be totally able to roleplay non-Baldurian even as a Human, Dwarf, Halfling, Tiefling, Elf or Half-Elf.
The tag will remain there tho ...
Aswell as all those options.