On limits to DAS per attraction, I don't see any compelling reason to limit DAS to once daily on every attraction. Many are such low hanging fruit, like it makes no sense to limit Under the Sea. It matters most on low efficiency rides (Peter Pan) and highly popular rides, both which result in longer waits.
While "reasonable person" is not the standard, applications of the Disability Act to theme parks has inserted gray areas, like this one, that I think a reasonable person argument can at least be persuasive to a judge. Anyway, that argument is that there is a wait time threshold that a reasonable person is not going to wait in the same line for the same attraction more than once per day.
Disney could identify rides with an average wait time over whatever threshold (60 minutes? 90 minutes? and say anything under has unlimited DAS rides and anything over is limited to once per day, or maybe once per day until an hour before park close and then no restriction.