I hope your son has recouped and is back to 100%. Anyone who has been around Motorcycles for any length of time will tell you it's not about if you're going to go down but rather when and how bad. I've been riding street bikes for over 30 years and even though my last wreck was a Van rear ending me and ending up on my right leg I'd rather die riding then live to be 90 and never ride again. It's a sickness and addiction just as bad as Heroin or Crack with a high for me that chemicals can't match.