Behind the NFL’s Touchdown Binge - WSJ.com:
"This drive to efficiency may also apply to the people who make the rules. If it's human nature to promote speed whenever the action appears to be slowing down, it's no surprise the NFL decided, in 2004, to tell officials to crack down on the amount of contact defensive backs can have with wide receivers. In scientific terms, the NFL wanted to make the system flow more efficiently. (The fact that touchdowns make for good television might have played a role here, too.)"

A pretty good example of trying to make the facts fit the theory. The league has been tweaking the rules for years in an effort to generate more offense. And why is an NFL offense the only part of the game that is supposedly "more efficient" or "faster"? It's a game of offense AND defense and both have been "evolving". Modern defenses are very fast and VERY big. QB's need to be 6' 5" just to see over the linemen! And this theory kind of distorts evolution. Things evolve to fit their circumstances, their environment, NOT to achieve some ideal. There is no "progress" in evolution, no design, no intelligence. To think otherwise is to miss the point entirely.