How do you know it will fail? The market will be much "newbies" but a fan base will grow as NFL is the ultimate marketing machine. Reasons why the Bills in Toronto has not been well received is crazy prices + uncompetitive team = no interest. If the early 90's Bills were playing in Toronto playing towards a Super Bowl run, I think interest would be very high & I know I would have paid the premium. If they had the past Sunday's game, Denver vs. NE in Toronto, I would bet it would have been sold out quickly. Winning cures all.
Raptors who are a sub 500 team is 10th in league attendance with 18K+ at home games, not bad.
Do I want to see the Bills move? No, the team belongs in Buffalo. I would rather see Toronto get an expansion franchise and have that rivalry with the Bills, that would generate much interest. In regards to the Argos, I don't want them to die and two different brands can co-exist. But it is a survival of the fittest.