In one sense, the system
@Lee described is not different than the old ticket book system. Or, if you will, like the county fair system where there's a flat fee to go in and then you pay additional for "tickets" to use on the rides. So I guess it's not as outlandish as it might seem at first glance. And there could benefits if all you want to do is ride a few things and be done; it'd also work well for that awkward half day people often have at the end of their vacation. But you have to price all this fairly, which you can bet is unlikely.
That said, two things, all based on speculation of course:
1. Didn't someone mention somewhere on these boards that digital screens were going to be installed at the ticket windows? Now I see why. A system like this would have the ability to change based on crowds and demand. As some have pointed out, it could go all the way to variable FP+ pricing on certain attractions - could be like watching the stock ticker on CNBC as prices and wait times go up and down! I know that's being overly dramatic and it's all a big IF right now but...wow. The nickel and dining possibilities are almost endless.
2. Wouldn't a system like this (where you have a limit on the attractions you can do) be the opposite of what Disney wants? If you only paid for 8 attractions during your day at MK, and you finish them by 5pm, what's the incentive to stick around? Do they think people are going to hang around for an extra 3-4 hours to only souvenir shop? Do they think the urge will be so strong to do more stuff that someone will shell out another $20/person for 3 extra rides?
Bonus point(s)!
3. How does park hopper fit into something like this? An extra charge to let you split how you use your attraction allotment between parks? And how do things like the nightly fireworks and parade (if there even is one at the park you visit) fit into this? Would each park have different rates based on the number of attractions they have? What about FP+? Would people who pay for more attractions get more FP+ reservations?
My head kinda hurts thinking about all this...