Honestly any of the other studios could have licensed D&D (or pathfinder) at any time for any project. There's still IWD out there to continue as well so if a studio really wanted one of the properties I don't know what would have stopped them. I believe that the only competition Larian had for the BG3 property was probably Beamdog. Not sure Beamdog would have made a great BG3 but it is thanks to them that the infinity engine games remained in the public conscious.