I talked to a CM who was a supervisor on the monorail at WDW and he told me(believe it or not) the unfortunate accident wasn't the reason they stopped the rides up front, he said it actually stopped a short time before the accident and the reason was there were arguments and actual fights occuring among guest who wanted to ride up front. So according to him this was the real reason. As I said believe it or not, but if they are still allowing it in DL it makes the story believeable.