Is Tony Stewart's injury the 'straw that broke the camel's back'?

   Former NASCAR Cup champion and Speed TV analyst Darrell Waltrip was asked Tuesday whether Tony Stewart’s injury will cause more NASCAR Sprint Cup owners to prohibit their drivers from competing outside their fulltime rides.

   Here is Waltrip's response:

   “When an injury happens to a driver of Tony’s magnitude -- one of the sport’s most visible superstars -- such as when Dale Earnhardt’s death spawned safety innovations, everyone takes a closer look.  We already were questioning the wisdom of racing in other series, especially sprint cars.  But I think Tony’s injury probably is the straw that broke the camel’s back," he said. 

   "Some owners and drivers now might decide it’s too risky and curtail this.  When Tony has time to evaluate everything, he might come up with some safety innovations that could make sprint-car racing safer.  Anytime something like this happens to someone like Tony, everyone will benefit down the road.”