Everyone loves to hate on the AAA, but the blame falls on all the other breed associations. All the AAA was trying to do was create a market for higher quality beef than most people were used to, therfore creating a better market for angus bulls. They were willing to gamble a shyt ton of money to make it work. Anyone could have done the same thing. Problem is, everyone else refused and I'm guessing snickered that the AAA were idiots because it was something never done before. It took DECADES for other breed associations to realize they missed the boat, but by then high quality beef in the US was synonymous with black angus.
Its also worth mentioning that theres a reason so many feedlots want angus based cattle, beyond just the possible CAB premiums. Because they make more money with them, CAB or no CAB. No smart business is paying more money for a product that may or may not provide a good return, not for 40 years at least. CAB would have faded away if feedlots didn't know for certain that angus cattle make them enough money to offset the increase cost to buy black calves, CAB isn't the reason for that.