What a defeatist attitude. WoW has gotten three new classes since it began, but only now do we have enough? If Blizzard is butchering already existing classes just to make room for new playstyles, then obviously we need new classes that they should instead be put in.
If Blizzard isn’t going to introduce new classes for these new playstyles, then they at least shouldn’t butcher the ones that already exist in order to replace them with these new playstyles.