The Buffalo Bills will be sold by October in an auction. While it would seem logical to move them into the far wealthier neighbouring city of Toronto, there are some who feel that the optics of such a move will create a negative backlash and cost the NFL fans in the region. Moving the Bills to another location - and they will move as Buffalo and western New York region are in a sad state financially - and moving another team into Toronto would, in an odd way, have a less antagonizing effect on the Bills current fan base and help to retain the region's current NFL fans as customers for a Toronto team.
How does this mesh with Spurs?
Toronto FC are owned by Maple Leaf Sports and Entertainment with ex-AEG honcho Tim Leiweke at the helm. Remember him from Spurs bid in the Olympic stadium deal? They are in a commercial arrangement with Spurs. MLSE are immensely wealthy owning NHL, NBA and MLS franchises plus other sports, media, business and property holdings. They've been retained by Levy to assist in commercial aspects (securing naming rights?) of the stadium project. MLSE brought Leiweke on board to take their business to another level. Since they're already worth billions and earn mega-millions annually, the next level is to become part of a NFL operation. By NFL regs, they can't actually own a team. But they can build and operate the stadium.
From what I hear from within MLSE, the deal is that if they help Spurs sort out their stadium deal, the NFL sets up shop there. Wembley can't accommodate a full NFL season, Twickenham's out, Emirates aren't interested, the Olympic stadium is a pooch for sightlines, so Mega Lane it will be. It's being re-designed for that purpose. It's smaller capacity isn't an issue as it's easier to fill week-in, week-out and presents a better image for the all important TV gods. The payback is that the NFL guides a franchise into Toronto.
The Union Jags has a cute ring to it and it seems the logical choice to move to London, given Jags owner Shahid Khan also owns Fulham. But it wouldn't matter where they move to since it will be an upgrade on Jacksonville. But it might matter greatly where Buffalo Bills move to.