Longtime lurker here. I visited WDW a lot when I was a kid and we lived near by but skipped about thirty years or so before I started going back 3 years ago. Thanks to this board my wife and I had a great time both visits. Long way of saying I have no clue what I'm talking about here.
I can't really believe that Disney intends to screw up 50+ years of queue evolution by deliberately making standby lines longer and more painful. They have spent a lot of money on this entire project and they are touting it as a revolution in what it means to visit a theme park.
Fastpass introduced the virtual queue. I would guess that FP+ builds on that and wonder if just maybe this a first step to making all lines virtual. There is no reason that I've read so far that that one couldn't just walk up to ride entrance and scan the card or bracelet and receive a ride time to come back. A FP+ just gets waved on into the queue of course. The ride time is added to the itinerary and you go do something else.
There would need to be a certain amount of line of course just to ensure ride efficiency, but that would be solved by having a return window. The return window would have to be much smaller than current FP windows. Lets say for example a fifteen minute window with 5 minutes before and 10 minutes after for a total return window of thirty minutes. That would probably make the queue a relatively stable thirty minutes or less in length. If the time one received was less than thirty minutes away one would get right into the queue.
People missing the window would move others up in the queue meaning one would need to check often for updates to the ride time if it was several hours away like I am sure TSMM would be. It would also mean more people clogging the walkways since they wouldn't be in line.
If I'm being stupid feel free to say so. I've just been pondering this whole thing in my head and this is the only thing I can see that makes sense. I've read a lot about this here and on other forums and blogs and whatnot and like most I'm just not seeing a lot of benefit to the avg guest unless there is some sort of endgame that we just aren't seeing yet.