That's what Whoopi Goldberg said in her complaint video. No joke.
Her argument was that the decision to stop supporting Macs was OK, but they should have been more vocal about it because a lot of people (herself included) preordered it on the assumption that it would be compatible with the same platforms as the last game.
I think she has a strong argument but I don't think anything's going to convince Activision to sink those development dollars in now.