I have two suggestions for you:I hesitated for a long time to post anything about our experience to these threads because of posts like this. I was simply stating what it would take to make it worthwhile for us to take our disabled teenage son to Disney. Disney and a lot of folks agree with your assessment. I would try to point out that until you try waiting elsewhere with a child with significant cognitive and physical disabilities, you may not think it is all that easy. However, having read lots of threads comparing disabled children to toddlers and other kids that have trouble waiting, there are a lot of people that agree with you. But the point is moot as DAS is here. Whether the DAS is fair and equal and does what Disney and general public expect it to do, time will tell. Everyone that enters Disney gets to judge if it is a good value and experience and if they will come back. We have decided that the DAS did not work for my family in its current form and other vacations may work better for us.
First is write Disney, not only via the website and the link for guests with disabilities, but also write a physical letter. Let them know your experience with the system, be as detailed as possible about what the problems were and how it impacted your vacation. I can tell you that there are listening to everyone right now and if you make sure that they know how upset this made you, chances are they will try to make it right by at least trying to fix the system in the future based on feedback.
Second is to keep your eye on this, one thing that I am certain will happen is that the DAS system WILL be tweaked based on all of the feedback that they are getting.