I also do not think that their main concern was fakers, And I'm not sure it's really as big of a problem as people think. All I have is the ancedotal evidence of how disney reacted, But their new policy specifically sought to reduce the number of people using DAS across a broad spectrum. If they were really concerned about fakers and fakers only, they would have gone a different route. My opinion is how disney reacted shows that fakers wasn't there only concern.
I agree that the number of "fakers" probably was not super high. ("Pretending' to be disabled when one isn't comes with some pretty bad karma).
The more likely, associated problem is "exaggerators." It's hard to discuss this without offending someone, and I am well aware that there are hidden disabilities, so I'm not accusing anyone either....but I know people who would fall into this category.
What I've seen (in the past) is someone who has, let's say, a mobility disability and thinks, "I'm disabled, (true) I should be able to get a DAS (not true). They would get denied and be shocked and then someone would tell them, "Oh, you need to also tell them that you...(fill in the blank)". The person would think, "that kind of applies to me..." and it would work.
To put it another way, it's like if Disney stated they would give DAS to people who couldn't stand in line because they turned purple if they were in a line for more than 45 minutes. I have enough faith in humanity to believe that very few people, who never turned purple, would lie. But I do believe there would be plenty of people who would say, "I turn kinda pinkish; that's close enough," or "I turn purple after 2 hours, but I "could" turn purple in 45 minutes."
I think that is a big piece, right or wrong, of who Disney is trying to weed out. Unfortunately, they are painting with a very broad brush.
I do think they are going to see some repercussions, though. I know several groups of people who used to go to Disney every week with a member who had a DAS (definitely not a faker). They already have changed plans. I don't know if Disney fully understands their reputation as a disability friendly place. A good number of people who rarely went anywhere on vacation because of the severity of their disability (or a family members') came to WDW because it was so disability friendly.
We joke about the fact that whenever my daughter needed a new wheelchair we would go wheelchair shopping at Disney. It's the only place that I've ever seen so any people in wheelchairs. We would stop people and ask about their brand and if they like it. People also would stop us.
Even though we had a good experience under the new system without DAS (and I don't consider us to be fakers or exaggerators), it was very stressful. My daughter is already suggesting that we should go to Universal more and Disney less because of the stress factor.