lol I was going to write something on here Sunday but we were go, go, go the whole trip so didn't get a chance to! You're exactly correct, OP.
I believe they said it started on Saturday, so we went on the second full implementation day. We were curious why the line was taking so long to get through. We got to talking to the CM and they were explaining why the ride changed over, but it seemed to not be working too well. Yes, the ticket corresponds to the assigned Dumbo number. If you are in a party needing more than a single Dumbo vehicle, you will get consecutive vehicles...in theory. People were/are still not going to the assigned vehicles and would also sometimes make a fuss about needing to go to a color that they did not want, so they took someone elses' that they did want and so on. In theory, it should make things go quicker and should stop people from running in order to get the most popular Dumbo vehicles but IMO, it's going to be too hard to enforce and eats up too much time. I feel bad for the CMs working the ride because it seems to be a hard thing to implement. I doubt it's going to last much longer.