Well, aside from all of the NFL fans who can't afford a trip to Europe to see their team play (in a city that has zero connection to the NFL whatsoever). If you can afford Super Bowl tickets, you can afford a flight to London. Doesn't matter, it's an utterly stupid idea. I don't think you're going to see some huge fan base created in England by holding the game there, and you're going to piss off a lot of your current base by doing so. I hope Goodell denying the idea (for London or Mexico City) are sincere.