I agree that I think people are missing the point of this thread. We all know that there are people who "abuse" the fact that people using wheelchairs or ECVs get some special treatment at WDW. We also all know that you can't always tell just by looking at someone if they truly have an underlying medical condition.
But sometimes you CAN just tell. Such as when you have a group of teenagers without supervision who are pushing a group member chair, and all the sudden, the person in the chair gets up and switches with someone else who now wants to be pushed for awhile. :shrug: And whether or not you can actually tell if someone is abusing the system or not...we all it is happening.
I agree that there should be a limit of "traveling party" for line queues, but dependent on the situation. If you have a group of 15 people and only one person is in a wheelchair, then it should be limited to immediate family or 2 or 3 guests. But if you have a family of 5 or 6 and one member is in a wheelchair, then of course you shouldn't have to split up.
I do have a problem with the bus system though...ECVs can navigate the bus queues, and when you have 35 people waiting in line to board a bus and just as it pulls up, so do 2 ECVs, everyone else is now standing another 10 minutes to accomodate a very small group, and you lose at minumum seating for 8 people. I believe they should wait in the queue or if there is a serious issue at that particular moment where they simply cannot wait like the rest of us, they should arrange a shuttle van with Disney or rent a private vehicle. Just my opinion.