I'm 100% positive Disney has done many proof-of-concept tests on the system before committing to such a large installation and have people who specialize in risk assessment. They will make sure no one is twisting an ankle, knee or hip other than they may have done getting off of a bus or stepping off a curb on their own.
We've seen videos posted in this thread that cars can be completely stopped for loading and unloading. That won't be an issue.
You are correct that the Disney clientele is a totally different demographic than ski areas (and mining). More children, elderly, special needs and just folk getting off and running back in at the last moment to retrieve that backpack/cup/sunglasses/phone. Seems the average IQ is lowered by 20 points when dealing with Disney transportation. This too they have thought of.
I just want to see the actual throughput numbers in action