They're discriminating football fans, Og. They've journeyed to see games in Detroit, Cleveland(vs Pittsburgh) and Philly. The Bills have been largely unwatchable for some years now.
It would be great if the Bills could stay in Buffalo and Toronto acquire its own franchise. The rivalry would be terrific. Whether the Bills would still get the support of as many Canadian fans as they do now might be a concern. They're not a rich team and Buffalo's economy is hardly robust.