There is a difference between a new race and a new core race, and new class and a new core class. Making new races and classes is not the same as making new core races and new core classes.
Druid, monk, barbarian, those are core classes; Aspiring Fist of the East Wind is not.
I see a "core class" as a class archetype that will get it's proportional share of players, and that helps to define the core play of the game. I think that
WoTC wants to control the feel of core classes, and wants to control the pace at which they are released to their customers. I think that the new license is easiest to understand as being prescriptive: Licensees are given very specific instructions on what to do with the licensed material. I don't think
WoTC wants the licensees to go much beyond what is prescribed.