Or perhaps the other way around.
Many of us feel adding a new AT should be very rare. Thus the need should be compelling.
Often its an excuse to get some broken inherent or some unbalanced sets of stats introduced.
For example. If we prolifered some Assault sets to Corruptors, you could basically do the Support+ Melee thing, without changing the game's character all that much. Since the inherent, hp, epics, etc already are hashed out.
But proponents always want the new AT. And to me that suggests something.