Universal has made a lot of changes at City Walk, and I guess NBA City wasn't pulling in enough people. I also wonder if the people who have the license were playing off between Disney and Universal to see who'd give a better deal.
I'm not a huge basketball fan, so I never even went into NBA City. I'm reserving judgement until I see what they build at Disney. If it's just a restaurant/bar with a bunch of NBA memorabilia I'll pass. But if they put in some interactive attractions (and hopefully some pinball) then I'd give it a try.