It would make the most sense for a Fox Sports Grill to open up there:
http://www.foxsportsgrill.com/
Fox Sports Grill has more of a nightclub vibe very similar to the bars and clubs in that area and all of the Magic games are shown on the Fox owned Sunshine Network and FSN Florida. They could do their pregame or postgame reports from the restaurant if they choose.
As for ESPN Zone, it makes the most sense to go into Dowtown Disney but that will make for three ESPN restaurants on property (ESPN Club @ Boardwalk, ESPN Wide World of Sports Grill at Wide World of Sports, and ESPN Zone at Downtown Disney). I still think Disney will do it since they aren't calling the Wide World of Sports restaurant the ESPNZone brand and so they should. Downtown Disney currently doesn't have a sports bar and it would be hugely popular with tourist and locals. Citywalk already has NBA City and Nascar Cafe and the closest sports bar to Downtown Disney is an Ale House that is always packed.