I can say that personally, the game being called Baldur's Gate 3 has had a negative effect on my willingness to purchase it. I came in excited for a true successor to those games. I did not care if it did not continue the story of the previous games (that ended in Throne of Bhaal).
But from everything I've seen, this is not a Baldur's Gate game. So far it seems to recreate very little of what made those games what they were. What it appears to be is a very good D&D game. But that's not what the title promised me. Call it Baldur's Gate: Attack of the Brainsquids, but not "Baldur's Gate 3". If I knew nothing about this game, saw it for sale, and purchased it, I think I'd be very very disappointed.
Do we know why it's even called Baldur's Gate 3? Is it purely for name recognition? That I get, but why the "3"? Why not just "Baldur's Gate: Blah Blah Octopus Adventures"?