Short Answer: Rogan is talking to hype the current crop of fighters and cannot possibly believe what he is saying.
If the purses in MMA rise, then so will the average athletic potential of the fighters. I am not disagreeing. With boxing there is more money to be made than with MMA so it seems that the best boxers will stay prizefighters. With other disciplines, maybe not. I also think this will be most noticeable at the lowest levels of the sport, not the highest. We already have world class strikers and grapplers fighting in the major promotions. I think Devil Dog Jim hit the nail on the head when he spoke about the abysmal quality of most local shows. MMA should soon hit a point that no one with 3 fights looks as sloppy as they often do today. The point about Condit dominating the first couple UFC's, at the time those were small shows drawing from a pool of whoever they could get. The UFC did not even rate the best fighter in the Gracie family, and it was a Gracie family production.
I also think it should be obvious that someone training one specific skill(boxing, greco, freestyle, kickboxing, BJJ, No-Gi, ect.) should be able to improve faster and to a higher level than someone who has to train both stand up and grappling. They have more time to practice and recover.
My major contention is that Rogan loves to speak like Fedor, and even Roy Nelson don't show prepared to fight. When the fuck did they gas? Nelson got out fought against JDS. He got tired because it is tiring to be repeatedly punched on the chin by someone who hits as hard as Cigano does. Fedor is 34 years old and has lost his last two fights bringing his record to an "abysmal" 31(8 knockouts and 16 submissions clearly not well rounded)-3 with one no contest. He is a multiple time World Combat Sambo champion and has won the Russian Judo Championships. Randy Couture's record stands at 19-10. His last three oppenants have been James Toney (does that even count), Mark Coleman, and Brandon "I fight so that Robert A will keep thinking I am going to live up to my potential, pick me to win, and then look like a jackass when I suck" Vera. Couture has never won more than 4 straight and the last time he did was in 2001. Does Couture train like a world class athlete? He was a world class greco-roman competitor. So by definition he does, but then so does Fedor. Except on April 30 Rogan will treat us to an explanation on how up to date Couture's training is, yet the game done up and changed on Fedor.
Evander Holyfield was one of the most rigorous and scientifically trained boxers in recent memory. He lost 2 out of 3 to Riddick Bowe. Bowe never looked like all that trim compared to Holyfield, but once the fight started he seemed to be adequatly prepared.
I am not arguing with anyone who has replied to this thread, because I know that if I start a thread and ask "Hey, I am an aspiring mixed martial artist/boxer/kickboxer and I need to know how to integrate xyz training methods into my program and look like GSP/Brock Lesnar, how can I get this done?" I will get a bunch of correct replies saying focus on road work, pad work, drills, and sparring. If I ask about getting ripped and implementing dynamic wackadoo tosses for time in order to raise my specific energy systems those of you not stroked out by the stupidity will tell me to train like a fucking fighter.