The fact that a Champion can't stay Champion forever will stop MMA be a bigger sport than Football, Soccer, Basketball, etc and the fact that MMA isn't a team sport.
Basketball, Football, Soccer, etc will always have its teams it has, and it will always be people's favorite team.
Example: A die-hard Lakers fan will always want to watch a Lakers Game. No matter who is on the team. When Kobe retires, Lakers fan will still like the Lakers, so Basketball will always interest them when the Lakers play no matter who plays for the Lakers. People eventually have their own favorite die-hard Basketball team and will never dislike them, so it will never make them lose interest in Basketball.
Brock Lesnar was arguably the most famous MMA fighter. All of his PPV did HUGE numbers. When he retired, people who were Brock Lesnar fans stopped watching UFC/MMA because they're favorite fighter or the fighter that interest them retired. Boxing doesn't do huge number all the time, it only does huge numbers when Mayweather or Pacman fights. People who aren't huge boxing fights will only watch boxing when they fight and they will always watch their fight as long as their Champions.
I HATE when people say "well WWE gets more viewers than UFC". It's simple. WWE gets to pick their Champions, its scripted, and they pick their rivalries. The Undertaker could be a Champion for 10 years and have a heated scripted rivalry with Brock Lesnar. Kids will die to see a PPV when they "fight". UFC can't pick Champions, pick rivalries, and script how everything goes down. Imagine if Lyoto Machida was Crane Kicking everyone for 5 years straight and then he has a heated rivalry with Jon Jones who has been spinning elbowing his opponents for 5 years straight? and both stayed undefeated? Man....UFC will do 5 million buys EASY.
I hope MMA becomes the biggest sport in the world and I hope I'm wrong with this thread but theres so many obstacles that will stop it from being the biggest sport in the world. Having the likes of GSP, Anderson Silva, and now Jon Jones is making the sport big. Having a consistent Champion will HELP make MMA bigger than other sports but won't MAKE MMA bigger than other sports for the fact that one day they will retire or lose.
It's just the fact that UFC/MMA really is "as real as it gets". And thats the beauty of the sport. We will never know what will happen next, who will rise, and who will fall.
As much as I hated to make this thread, I LOVE MMA and I'll dream and pray for it to be bigger than every other sport.
MMA > Football, Soccer, Basketball, Baseball, WWE, etc is what my heart will always say!