Wow, that is hugely restrictive. I'm glad we made it through our kids being short before this happened. Some might consider what I've done in the past gaming the system a little bit, but when you have three year olds and basically have to get out of the park by 2-4 before nuclear meltdown occurs, rider swap really helps even the odds and lets you get to do a few more rides despite your young kids. All that aside, being able to only hold one at a time, that's really rough even playing the game completely straight. Say you hit Frontierland in the morning, you ride Splash Mountain, and someone has to wait with the kids. Splash takes 20 minutes to go on even with no line. To have to ride it again before doing Thunder and getting a swap there really ruins a plan. If you get swaps for those two, then the nonrider can do them later in the afternoon or evening, after the little kids have left. That was the beauty of it. And that's gone now. A shame...