The Leafs don't sell out every single game because they're a good team. They sell out because this place loves hockey.
I'd love to see another Canadian team back east. If Florida can sustain 2 hockey teams, Ontario should have 3. If you think a place like Markham can handle it, I can see why. I just wonder why they wouldn't go for a different city like Missassauga or something. (Yes, I know they would have to build an arena)