I'm mostly with KenJ and Robyn on this one. I appreciate that Disney is so accommodating to guests with disabilities and feel fortunate to have never been in need of these services (although we will likely experience working with the Guests with Disabilities services in the spring when we bring our senior citizen parents with us). Even with the parents (whose issues range from chronic heart/lung conditions to arthritis), we will likely only need mobility assistance. We may use the disability pseudo-fastpass system so they can sit down someplace nearby to wait if necessary, but mostly we're planning to just take it slow.
There is one instance where I can see that this new system might not be sufficient to help guests with disabilities to enjoy the park and that would be for guest with autism or other disorders that cause a person to become fixated on one thing and can't understand the rationale that they will get to come back to the attraction soon, which could lead to very unattractive behavior that can quickly spiral completely out of control. I recently read the book "3500: An Autistic Boy's Ten-Year Romance with Snow White" and I try to imagine Ben's, the boy from the book, parents trying to explain to him that they could come back in 20 minutes and I can't see it going particularly well. I used to teach a special needs gymnastics class and there were kids in that class that would have been able to see the attraction in front of them, have mom or dad get a return time, leave for 20 minutes and come back later. And there were kids that could not have handled that situation in a million years and would have become fixated on completing the experience and would have become very frustrated and uncontrollable at not being able to accomplish this immediately.
Unfortunately, I think that Disney made the only decision that was reasonable by scaling back the accommodations for disabled guests in order to curb the abuse of the system by healthy people. The internet is big and there are A LOT of people who go to WDW, Disneyland, and global Disney parks every year. We ALL want to find a way to get a better vacation and find out how to get it while doling out fewer of our hard-earned dollars (or euros or pesos or yen or whatever). That's part of why we hang out on these message boards 
Do you remember the photos advising guests to yell "Andy's coming" near the Toy Story characters? They used to drop to the ground, but so many people saw the idea online and started doing it that they had to stop for the safety of guests and characters. Another instance is pin trading. Now that word has spread that you can buy pins on ebay and trade them in the parks (even if they are scrappers), the demand for low cost pin lots has increased and more sellers are providing the fake pins, which are overwhelming the real pins in the parks. I heard a few months ago that Disney has finally started to prosecute people who are importing the fake pins and defrauding guests by selling them at such a low cost. With major news outlets reporting on the Disneyland disability scam, Disney had no choice but to do something to change the existing policies. Sadly, there are many people who will exploit such a loophole and when it is done on a mass scale, it detracts from the experience of all guests.
and I got the new DAS card. At each attraction we used it for, they wrote down the current standby time, minus 10 minutes and told us we could return anytime after the allotted time written down and go through the fast pass line. I found this incredibly helpful and very fair. I was waiting the same amount of time, minus 10 minutes, as anyone else. I just got to wait sitting down somewhere in the shade. All the workers were very nice and considerate. It made our visit even better because I was able to experience attractions I would not otherwise have been able to go on because I can't stand for too long of be in the sun for very long. My experience with the new DAS card was an A+.
