Yeah, don't think MMA will pass soccer worldwide. Who knows about American football, though.
But I think Rogan is just saying this stuff because he doesn't watch any other sports besides MMA.
Do you? Really, how does someone watch a baseball game or football after they have seen a UFC or Pride fight? Not me!! Too boring if you ask me.
I hate watching baseball and football period, too boring for me, especially baseball. Put me to sleep.
But I can watch hockey or basketball after watching MMA. I'm not saying basketball or hockey is more exciting than MMA, but I can watch it because I like them and I don't expect the same thing. (Well, in hockey you can punch someone, but you can't tap them out or anything. lol)
But yeah I think Rogan just doesn't watch any other sports, at all, nothing. So, of course he's going to think that MMA is going to be the most popular sport ever.