I, for one, would cancel my season tickets if the Bills played two games in Toronto. I do think though, that the NFL should expand to five teams in each division, and I do feel Toronto should get a team. I think if Toronto had an NFL team, the rivalry would be something fierce with the Bills. I think that would be awesome.
When you see countless college stadiums filled every Saturday across the nation, adding 8 more teams to the NFL would be simple. You could then fill every possible expansion city, and integrate Canada. To me, it just doesn't seem like 4 teams in a division, allow for a big enough race.
Football is plenty popular enough to expand. There are also plenty of good QB's and other players around to not water down the product.
Toronto would be high on my expansion list. Right after LA.