Well i dont think larian must change their plans for this game...
Speaking of Fallout even if it not exactly the same thing... remember Fo 1 et 2 was turn based for combat. When the third opus of the franchise came out many of "self proclamed true fans" go into absolutely mad bad buzz... because the turn by turn gameplay was gived up.
Here ... for larian it's the opposite. They cant please everyone. It s impossible.
The worse part of it ... if BG3 happen to be just a remastered version of old BG games... not sure it will make good sell in 2020. Dont forget... angry geeks are usually the more audible of the internet but they're not always illustrative of the whole community. Think about it... how many actual players exept old ones have played BG 1 and 2? Not so many i think.