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.