I would like to come back to the thread creators "Problem"
So, TLDR; if Larian uses the brand of Baldur's Gate they should stick to it's roots and keep the core game design as the fans loved it. Else, they should just create any other brand, even if it's based in the forgotten realms universe, as Black Isle did with Neverwinter Nights. But please, don't split the fanbase.
I really think that all the expectations cant be fullfiled with a Game Title of Baldurs Gate 3, so in fact if they what to create something in this D&D world, why not taking a new title, maybe something what is gonna be an spin-off then?
But changing one core element and the fighting system is one of it, is so crucial so why taking the Name of the Game with no respect to that? It will definetly sell better, but it also will cut down the possiblity of the real successor of BG1 and BG2.
Fallout Franchise did exactly that to the series.
heres one of the most annoying things in the current games industry.
Because sequals like fallout or oblivion were "dumbed down" from the previous iteration, people now, ironically, are afraid of innovation.
Let me tell you something, Fallout was dumbed down for the EXACT same reason you are giving here. fear, fear that the fanbase might reject it.
An isometric game? In this time? no way, it HAS to be a shooter.
Same with Divine Divinity. A Turn based RPG? In the west? no it has to be like diablo (not that divine divinity is bad)
Its not about the game beeing dumbed down. Right now you go a "non RTWP Baldurs gate game? Heresy!"
Its the exact same reason thsoe "dumbed down" games exist. Conservativism and fear of innovatin.
Innovation is a sort button in the inventory or an mouseover Wiki and i would like to see all of that, but Turnbased Fighting or 3rd Person is something which is a game design decision and for Baldurs Gate it was made in 1998, if we now get the third game, why changing it?