Watched a program a few months back about the state of Heavyweight boxing in the US. Apparently very few big guys take up the sport anymore because the lure of the potential earnings in American Football and Basketball are much better and the system to get there (i.e College programs) are far better supported.
Showed a guy who had set up a specific Heavyweight boxing program to grab athletes that had failed to make the pro's from college and training them up as boxers. An honorable sentiment but not convinced you can grab a guy in his early 20's and expect him to be a decent pro in a reasonable time. Most boxers start training when they're young lads!