There can be no contact sports for an endurance athlete, or even for a regular civilian. The risk of a serious injury is TOO high. It's stop and go, and multi-directional. Pros get paid millions to play, so they have the money, doctors and TIME to recover.
It was not a wise decision on his end, and it is going to take him up to 2 years just to get back to normal. Track and field just took a huge hit, because it just lost its face of the sport, and no one in the wings to really take over at the moment.