Well, not until they find a cure for brain injuries. However, I have heard of professional athletes returning to their sport after they took a few years off to recover. I believe Larry Johnson did this after taking two years off from a serious concussion he got while playing. However, please don't let that be any indication for you returning to soccer. For all we know, he could be damaging his brain by playing but just doesn't care b/c he is getting payed millions to play.

Like I have posted before, with the advent of stem cell therapy, the cure is around the corner - probably only 5 - 10 years away, conservatively speaking.

One day, we may all be treated the same as cars are...get an injury, walk into a clinic, have them extract bone marrow cells, induce them to your specific need and - blammo, just like a new organ.
(for those of you who have lost your sense of humor, of course I'm joking here, but you get the idea.)