I haven't read every post but I'll weigh in anyway.
There are already places that do this. Six Flags, for example, adjusts pricing by season and day of the week. There is a HUGE difference between them and Disney, though. Six Flags is a 1-day experience, not a 4 or 5 or 7 or 12-day experience. If they start changing prices based on the day, I don't know how that will work. Right now, if I go to Disney for 2 weeks and buy a 5-day pass, I can use those 5 days whenever I want to. What would happen with the new system? Would I have to decide in advance which days I wanted to go into which parks? That would suck. It's easy to say your hotel will be more expensive on Friday and Saturday night. It's much harder to say the Magic Kingdom will cost more on Sunday and less on Thursday.
If it is more of a seasonal variance, that would be a lot more manageable: from this date to that date is one price.
I really don't see how this controls crowds, though. Most people go to Disney when they are able to go based on school vacations, work schedules, and other issues. Our last two trips were one that tacked on days to a convention we were attending in Orlando and one that was while DD was home from college for winter break. Neither one was really adjustable by more than a few days either way. Our next trip in July is for the DIS 10th anniversary which is a fixed date. Rarely are our visits flexible beyond maybe a few days one way or the other. So tiered pricing would have no effect on when we visit. All it will likely do is raise the cost (because I'm sure it won't lower it).