Did Blizzard ever give a reason for not supporting Macs? They used to be really good about supporting them (I played a lot of WoW on one for years with zero issue). Guessing the extra effort required to support ARM didn't make financial sense?
I'm sure there are plenty of up and coming development studios that are more than happy to create a product that can run on multiple different machines.
Blizzard got derailed by Activision and probably cannot be saved now after at least a decade of solid management into the ground.