I'm not really sure what touring "normally" is, but I think a lot of people can't do it. Disney is tough, physically and mentally. We spend a lot of time trying to cool down, avoiding various stressful or strenuous activities, getting food or beverages, and going back to the hotel to rest, often for long periods. In other words, we spend a lot of our non-waiting time tending to our needs, too! But our issues aren't specifically about waiting in queues, so DAS wouldn't make sense. It's more about heat, overstimulation, lack of stamina, etc.
I'm just saying that people in the park have quite a range of abilities. We could all use some help, here! I really hope this issue makes Disney think about the significant challenges of the parks. I doubt it, though...