When I bank points, I'm not saying I don't want to use them, I'm saying I want them later. They are not "extra" - they are mine to use later. (no one should sell my "extra cookie" because I said I will have it later). Some people may be borrowing their points - not taking someone else's. I may bank 2015 points, change my mind about reserving a trip and need to borrow 2016 points to make it. So, I just switched the use year points I'm booking with, but I am still using all of my points eventually.
If there's availability, someone can use their points to make a reservation. If there's no availability when they want to go, they can't use their points unless then look for another time that is available.
Sorry, maybe I'm missing something but I don't agree. Maybe there would be a problem if people could save their points for any amount of years (I was suggesting the 3 years limit, but being able to unbank or unborrow during those 3 years), but it would be member's problem as they wouldn't be able to book, not DVC's if they only have a certain amount of rooms they want to put as available.
Well, herein lies one problem...they aren't your points. You have a right to use those points for a year, with the option to extend for a year within the rules of the system. If you don't use them, the right to use that those points represent reverts to their actual owner - Disney. We simply lease.
There is a huge distinction between ownership and right to use.