The WSJ has an article on the problems with chicken breasts. In addition to the 'woody breasts' problem, they're now seeing chicken breasts that fall apart, looking like spaghetti strands.
Researchers aren't sure what causes these problems, but they seem to be related to the selective breeding over the past 40 years that has increased the rate at which chickens put on weight. Today's chickens are at 6.3 pounds in 47 days.
Some restaurants have started purchasing smaller birds, which seems to reduce complaints. (I know when I buy chicken breasts, I buy the package that weighs the least these days.) Costco is building a chicken operation in Nebraska, but they don't let their birds get huge.
The article might be behind the WSJ's paywall, but here's a link:
ast-Growth Chickens Produce New Industry Woe: ‘Spaghetti Meat’