Sure, he definitely deserves some credit, but even if he laid the groundwork it's Feige who has actually built it up...and is continuing to expand it. He's suggesting that Feige deserves no credit and is being told to take it because his superiors are making him. That's just stupid.
I don't agree with him (I would love to see Wakanda) but I'm guessing it is because Asgard is not on Earth and Wakanda is. The MCU taking place on a more "grounded" and "realistic" Earth would make Wakanda being around a strange revelation.
That being said, MCU is getting further away from "reality" with every film, so that's not really an excuse that can stand at this point (and I imagine especially not after Age of Ultron).