I think people are underestimating just how lowlife folks can be.
For example, as someone who doesn't need DAS, what is to stop me from doing exactly that and then wondering off to go ride a few other rides instead of going to the restroom or whatever else I claimed before coming back at my return time?
Really the only thing that is keeping that kind of behavior in check is that most of the time, it would only work for parties of 1 or 2 which does limit the damage. However, I wouldn't put it past an unfortunately sizeable number of people to break their party up into ones or twos and try to use that as a single rider system for long waits resort ride.
I just hope Disney tags the people doing this kind of junk and makes a few examples were possible. Maybe that will make some think twice.