I think the biggest argument against the idea of CS becoming a household sport like football is the fact that, today, nobody bothers to watch competitive paintball. The fact that it's a simulation means it can do things you can't do in real life, sure, but it also means that it's harder to care about what's actually happening. In a real sport, you watch the players. In an esport, you watch avatars. People don't empathize with avatars nearly as much as they do with flesh-and-blood humans, at least not today.