Firstly big love to the OP you're doing an amazing job, I have a DS4 ASD so I know where you're coming from.
Also as an ASD mumma bear, I might be getting overly sensitive but I've been on a few of the DAS for Autism thread and there seem to be a lot of misunderstanding around the condition in some of the comments.
Now I am positive that they are not meant that way as I know people are just trying to be helpful, but certain comments can come across a little bit judgmental and ill informed.
ASD is so complex even for someone who's living it, like me, I still needs to take a step back and think about what I am writing, as my child needs could be vastly different from another child's needs.
So with my sensitivity bit over with back to the original post, the DAS pass was really helpful for my Son who has trouble with people and crowds - I find Disney such a positive place for ASD people. I know I rave on about it (see my previous post lol) but everyone was so helpful from GR, to the restaurant staff, photopass photographers, characters and their handlers, hotel staff the list goes on and on.
My advice is be vocal about it and honestly it will make your trip easier. That's why we couldn't wait to book up again - I'm now worried about going to other vacation spots because Disney is so great they might not live up to that standard.
Lastly whatever happens with DAS or not, I hope you have a total fantastic family vacation