That, and the fact that there is money to be made from BJJ. Here, it takes a minimum of ten hard years to get a GJJ 1st Dan. I took a quick look around and see that some people out there on the mainland are claiming BJJ 2nd after six or less years. I just spoke to a student of mine who runs two Relson schools here and he told me exactly what I wrote above, that people are coming here on vacation, want to get some roll time in, and promptly get tapped by lower belts. He said his private lessons have shot out the roof from visiting BJJ practitioners. My student also said that there are pockets of excellence,those who stick to the "old school" ways, including the Machado groups. So back to the OP, if GM Chuck Norris got a black belt from the Machados, then I am sure he is the real deal.
This is pretty typical, and you'll hear the same rhetoric coming from just about every corner of the USA, as well. But when you go down to the Pan Ams or the Mundials and watch everyone compete, from white belt up to black, the quality is high and the standards are consistent. These guys come from all over the world. If the BJJ were so much better in Hawaii than anywhere else, the winners in each bracket would be Hawaiians. But they're not. Hawaii is not represented out of proportion to any place else.
And at every change in the wind, you will have some who decry the change as a lowering of the standard and some who embrace it and move on. For example, there was a time in BJJ when the half guard was considered mostly a stalling position. From half guard, the expectation from the bottom was at one time that the primary goal was to move back to guard. Now, half guard is considered by many a stronger offensive position than full guard. The same has been true for de la riva and now the same controversy is happening with 50/50. There are examples after examples.
Ultimately, as I said earlier, it sounds to me like speculation and wishful thinking on the part of guys who have no first hand knowledge. Making money has been a part of BJJ since the beginning, as have high standards. The two aren't mutually exclusive. If you're suggesting that BJJ continues to evolve and change, I'd agree wholeheartedly. The easy access to quality information, the DVDs, YouTube and just the availability and quality of the tournament footage, coupled with higher quality personal instruction available as schools grow and become more common, is making the art stronger, not weaker.
Are there schools trying to capitalize on the success and current popularity of the art? Sure, but unless the owner has rank, is qualified to teach and encourages competition among his students, it's specious to suggest that he is representative of the style in any way.
Edit: Just to be clear, when I speak about anything related to TKD, I try to be very careful to qualify my statements and ensure that they are made in context. It's just polite, IMO. Were I to make an unqualified, uninformed, blanket statement about TKD, I'd fully expect to be called on it, as I've seen you guys do repeatedly in the TKD forums.
What I think might be helpful are some specifics. Which schools are lowering the standards? Gracie Barra is the largest organization. Do you think they're lowering the standards? Pedro Sauer has a huge number of black belts teaching across the world. I'm with Lotus Club, and my instructor competes internationally and has done well. Lotus Club is smaller than other affiliations like Alliance or Gracie Barra. His coach is Giva Santana, who has gold medals at the pan ams, beating guys like Damian Maia, and has, IIRC, a 17-1 MMA record. Are we lowering the standards? What about on the East Coast... Lloyd Irvin? He's making a boat load of money. Is he lowering the standard? Every BJJ school I know is associated with a larger group. So, which group is it that's lowering the standard? If you are more specific, maybe we can get to the bottom of this.