I would pay good $$ for a Larian Warhammer 40k game, even though I am not sure how they would write the weird morality of the setting, since the good/evil choices in BG3 are so black and white. But Owlcat's Rogue Trader has me frothing at the mouth for basically anyone to make another 40k crpg (though despite Rogue Trader's issues, I think that game sets a very high bar; absolutely love it).

Larian to Pathfinder 2e would seem to fit better as far as other IP's go, IMO. Or Warhammer Fantasy, which I'm not as familiar with yet but would obviously love to explore in a crpg.

Despite my criticisms of BG3, I would have loved to see another Larian game set in Cormyr or Planescape or another D&D setting, but I respect their decision to move on to something they're passionate about. Nobody creates their best work when they're burned out.