These concerns about safety are half the reason I don't like the idea of re entering a race once you dnf. The other half reason is it just isn't fair to people who get bumped back as a result.
Say 20 elite start...typically a few dnf...placing them at the back of the 20 pack means it becomes more difficult for up and comers to get into "the mix" to gain experience as they keep losing their opportunity to advance in the et days starting order. Instead of starting 19th like they deserve they get bumped to 21st (example) and lose a minute on the guy in 18th....i see how this can screw the top of the non elite out of the chance of moving into the elite category.
It also just seems wrong and not in the spirit of the sport. Ned mentioned the top guys ride full throttle but surely they must conserve motors or let themselves slip on a stages standings to better position themselves for the next day...sometimes. A previously dnf'd rider has none of those concerns. In theory the dnf guy could be running a fresh motor as he no longer has concerns of penalties...just one goal...to stage win for the publicity...
Just more rambelling thoughts