I also think its a bit annoying how mma fans believe that mma fighters would just light up top boxers even lower ranked guys. Just not true. Some ****wits think Ronda Rousey would beat on Floyd, are you kidding me?
It is true. Just look at the history of the UFC (or vale tudo earlier): at the beginning 99% of the fighters were proficient at one style and one style only, and there was a clear dominance from people who knew how to fight from the ground (judo, bbj, wrestlers, sambo, etc.). This happened not just once but a plethora of times.
The lesson was, simply put, it is easier, way easier, to get closer to a person (taking minor damage) than to keep someone away from you.
If today Ronda Rousey and Floyd would meed in a ring with no rules, as much as i hate to admit it, Floyd would lose. He would be able to dodge and counter any punch she might through, but nothing he could do against a tackle. Once the fight goes to the ground it's a no brainer.
Any top 10 UFC fighter from his weight class would take Floyd in less than 5 minutes. It's not that he is an imbecile or something, it's just that he wouldnt know how to defend against a takedown and would be lost on the ground.
I can name a ton of fighters that have been paid in the millions in boxing for a single fight there would be less than 5 mma fighters that would have ever happened for.
Popularity and effectiveness ain't the same thing.
Don't look at the sheer numbers, look at the growth of the sport over the last 10 years and compare mma to boxing.