My point was that four one-spec classes are really not that crazy out of the question after Demon Hunters came out. The biggest damning thing is that "lol too much effort" and the argument is that they crapped out a filler expac to give them more time + no new class for 4 years.
Another argument is four extra class sets per tier, and they really may just not make them for those classes. Maybe they will add a "heritage set" for them.