All those arguments about it not being BG3 flying around these formus and I have yet to find a person to actualy explain why. So let me try here: OP, what exactly should be made for it to be a Baldur's Gate 3?
It should use AD&D rules obvs, despite them being 2 editions out of date. And be in 2D, because, technology, FECK technology. And continue the Bhaalspawn story, despite it being concluded in Throne of Bhaal.
Nah, but a more thorough implementation of 5e would help.
