ESPN Radio = Home of the Jets
Francesa is all about ratings, and he's still the ratings King. That said, Rex/Woody made the Jets the talk of the town the last 4 years. Twice they've figured out ways to take the spotlight fresh off of Giants superbowls. With that, ESPN has weekly interviews with the Jets, things the organization won't set up with Francesa. So while Francesa still owns the afternoon drive, ESPN is coming in hot with access to things WFAN doesn't have. And a lot of it is just the Jets willingness to do interviews with 1050 over WFAN.
Couple that with Francesa's career long schtick of saying things for ratings and you have a fiery-red, steaming Mike Francesa. As if Rex stole his lunch money.