Could Larian make an action-RPG BG3? Sure, but why would they want to? DOS2 was more popular than PoE2 or Kingmaker, and the XCOM reboot and games like Fire Emblem are doing great as well, so there is definitely an audience for turn based tactical games.
Except for that you have ZERO evidence that it was the TB aspect of D:OS2 that made it "more popular" than those other games. It could've been so many other factors.
Hmmm, you could say that about most games. I have zero evidence that the first person aspects of Call of Duty or Halo is what makes those games sell well and that they wouldn’t sell better if designed to be third person. That doesn’t change the apparent fact that there is an audience for FPS games.
Plus, there is evidence- DOS1 and 2 received a lot of praise for their combat.
