I think I'm in the minority when I say I enjoy NBA City (for what it is). I've never had a truly bad experience.
However, a WWE Hall of Fame would be pretty cool. I'm a life long wrestling fan so that's easy to say. However, I don't think it would last at all. I can't see people leaving the parks for a wrestling hall of fame... and if there's nothing but props, it seems like it'd be hard for them to stay open on CityWalk, especially when people would have to pay for parking if they aren't Universal passholders.
I think this will be a "we are here so we might as well go see it" type thing, I don't think wwe will charge admission