I will also add a few more comments on the athleticism aspect. There is a reason why you have more and more people who "train UFC" (God, I hate when people say "UFC" instead of "MMA"). There are a lot of people who fight now too, and label themselves "fighters." These are guys who aren't nearly as athletic as the quality of athlete you will see in the NFL and NBA. You don't see many people who call themselves basketball players. It is one thing to play basketball with friends or even in a league, but it is different than what you see with people in MMA. There are way more delusional people who have the goal to eventually be in the UFC than there are people who have a goal to be in the NBA. You can't enter the NFL and NBA if you haven't been playing it for years (since high school at the VERY latest). There are still fighters whose credentials aren't that great that fight for the most elite organization, UFC. It hasn't been that long (? 15 years) since you saw guys like Tank Abbott fighting in the UFC.
I think people are sensitive to the idea that other sports require more athleticism because either they practice MMA or some aspect of MMA themselves, or they are huge fans of it. It is similar to how golfers (zagga, where are you at?

) will argue that golf is a sport. Now MMA is definitely a sport, but the level of athlete is nowhere near that which what you see at the professional level of football and basketball. Perhaps when MMA has been around long enough, has competitive pay (both on average and at the high-end), is as big as sports like football and basketball, and has simple things like fighter unions; then you may begin to see the most elite athletes transition to it. A lot of the athleticism you see in MMA fighters is a result of hard work (which is very noble); but like it or not, the potential for elite athleticism is genetic. People with the genetic potential both on a physical basis and athletic basis to be an elite athlete who also take the time to train and practice to reach their full potential will continue to choose sports like football and basketball for quite some time.
It is possible for a man with no MMA training (sans being an elite wrestler) to enter the UFC (the most elite organization) and WIN the heavyweight championship (I am looking at you Brock). This will never happen in the NFL or NBA. What is great about this comparison is the fact that Brock tried "to just enter the NFL" like he is getting an application at Starbucks, and we all saw what happened. He admits it himself that he didn't know what the hell he was doing (he played football all they until high school too). He made it to the training camp, and that was it. There will NEVER be a person who just enters the NFL, let alone win the MVP award (equivalent of winning the most prestigious MMA title).