If they go back to using the system as it was designed (not override the safety system), I don't see how they would be at greater risk than people standing on a bus... Or even people seated in the bus without seatbelts.
After the accident, all the very in depth discussion here was facinating about how it all works, etc... And the one thing that seemed to be repeated over and over was that Disney had gotten too lax with the automated safety system. They would over-ride it in too many situations. Anyway... My point is, if they changed the policy to allow riders unless a safety over-ride is being executed, I can't see how it's not safe. There are many other forms of transport on property that I think pose more risk. :shrug: