According to the Forbes report, the reason for the NBA teams gain valuation at such a high rate right now is in large part due to the TV deal with TNT and ESPN/ABC.
You misunderstand what Disney is trying to accomplish with Disney Springs if you think they would open an ESPN bar/restaurant, though. They are in the leasing business, not the operating business when it comes to all the new stuff. They want to sit back, do nothing, and just play landlord.