This is the stupidest idea that keeps on getting repeated. Moving to Toronto is not like moving to Rochester or Syracuse. What connection would WNYers have to Toronto? Toronto is a fine place, but it's a whole new country and probably would keep little -- including the name -- to connect it to the old team and city.
I do not live in Buffalo itself, but haved lived in WNY and CNY. I mean are most people even fans of the Blue Jays? I do not get the impression that they are any more popular than the Yankees.
I would feel more connection to the Browns than to the Toronto Whatevers. I either won't care about the NFL, will root for the Browns or will root for my in-laws' team, the Giants.