yeah but you can't just shove disabled guests out to the parking lot or put up a tent in next to the solar farm. From a practical standpoint, you'd need something larger than the dumbo waiting area right next to every D and E ticket ride in every park. The only way you are achieving that is by losing either revenue producing guest areas or sacrificing cast areas ( which in turn causes expense in having cast to travel further for breaks or storage or whatever you tore down to build). Starting from scratch with a new park you could probably do it, maybe they could pull it off in Epcot or DAK at some level. But I don't see way Disney would ever sacrifice that level of space in DHS or Magic Kingdom.