NFL team in Toronto.... Could it actually happen?

[MicroBob]

Maybe on the end-zones or something there is room for more seats.
But on the sidelines I would assume you can't add seats because the front row in the main-stand is already as low as you can realistically go and you don't want to just put seats in front of those that would block that view...and you don't want to put a bunch of chairs at ground level.