One of the guys in my group has just given up after a long, frustrating bout of problems with things like Parallels and dual boots, so this is a concern for us, as well. I believe TSW has a Mac version forthcoming, but I haven't looked at that in a while. WoW is the only one I know of, and theirs is pretty solid, for whatever reason.
Even on the night of the 30th, Pat had to fail and retry loading CoH close to a dozen times before he got to the login screen, and that was pretty typical for him.