One angle the current rumored system does not address... is the idea of abusers getting multiple cards for party to get more rerides. They should make it so a DAS holder can not also be a 'guest' of a DAS holder.
Here's how you would work it.. and why it needs to be addressed.
I'm a party of 4 dudes. I send Dude1 in to get a DAS for his party of 4 (Dude1...4). I then send Dude2 in to get a DAS for 'his' party of 4 (same Dude1...4). Now we have 2 DAS cards in our party. That means we can hold up to 2 different DAS 'time slots' at the same time. Extend the scenario and you can get more.
Dude1 goes to kiosk and gets return time T1. Dude2 goes to kiosk and gets return time T2.
Now you goto the attraction, Dude1 flashes his DAS, and all four people get on. Woohoo! Let's ride again! Loop around.. Dude2 flashes his DAS and all four people get on again. Of course Dude2 could have gotten a return time for a separate attraction in the first place.. and reduced his effective wait by doing the first attraction while waiting for his T2 time to come up. No go and get new T3 and T4 times... and repeat the process. Now the group can bounce between rides with reduced waits with minimal effort. The more passes they have, the more rides they can do before turning to the kiosk.
Now here is the problem. You can't limit a DAS to one per party. Why not? What if a family has two disabled kids that each prefer different rides? If you only had one pass, you'd force the pass holder to ride everything. If little Johnny doesn't like Space Mountain, but his disabled older sister does... she needs her own pass. Now each child needs their own pass.
You could 'mark' each DAS accompanying guest with a stamp... but you can't exclude a stamped user from getting a DAS for the reason just mentioned above. The solution is to require DAS guests to have their own timecards.. which can only have one time on it at a time. But Disney's solution appears to be more like a FP pass that is consumed.. vs a timecard that is reused.