I've been mulling this over for a while, and I think a tiered pricing system will fail for Disney on the 2 counts that will matter to them (a) more revenue; and (b) crowd control.
As folks have said before me, having price tiers for busy times, will just make it way too complex... especially since the plan they've laid out is not blocked out by "months or weeks", but by days.
------> The simple fact is that folks who are restricted by their work and travel schedules, are going to come based on when they are free, whether or not the price of a ticket goes up or down. (Elementary & High School Teachers, College Professors get off work in the summer, and on holidays, and oh yeah, spring break) The airlines already try to make travel during these time periods "cost prohibitive" -- and people still travel.
-----> The reality that folks are going to come based on their schedule, which means crowd control won't really occur. Maybe, as folks mentioned before, this will give some incentive to visit other Orlando attractions on so-called "gold" days, such as Sea World or Universal, or stay back for a relaxing day of rest and sunning by the pool, but without "additional" ticket policy changes, Disney will be dealing with lots of unhappy tourists.
a) Advanced ticket sales become far more complex.... Many folks buy vacation package months in advance, capitalize on 60 day advance Fastpass reservations, ADRs, etc. Price tiering will impact all of that
B) its currently easier to "change" one's vacation days months in advance, which will become more difficult with tiered tickets.
b) I believe current ticket policy says I can use my tickets any day up to 14 days past first use - this will have to change with tiered prices. If I buy a silver ticket, and am not allowed to use on a gold day - either I lose a day on my use or disney has to allow for x number of silver days.
-----> Even if Disney effectively "controls crowds" on "gold" ticket priced days, what they fail to realize is that they have probably just redistributed the crowds to the "silver days" which will now be more packed than ever.
-----> Most experienced Disney travelers already self-monitor for crowd control (many of us plan in advance which park we will go to on which days based on park hoppers and Extra magic hours, based on the high crowd/traffic charts that some of the websites put out, etc),---I don't know that changing ticket prices will do that much more. Folks that are oblivious to crowds are going to remain to be oblivious. Folks that monitor crowds are going to continue to monitor, and if anything, the ticket tiers will make it more difficult to monitor crowds because it will probably redistribute the crowds except for the truly "off season" (Late January & February; Late september & october)
-----> If families have to pay more in ticket prices overall because of a tiered system, families are going to find a way to save money elsewhere.... meaning that either
(a) they will cut a day or two off their overall stay to save $$ in ticket and hotel prices
(b) they will reduce the budget for souvenirs, meaning less money spent in the parks
(c) they will find ways to save money on food (either through dining plans, or packing granola bars, or by buying groceries and eating back at the hotel)
Thus any increased revenue disney hopes to gain from increased ticket prices, will probably be nulled by families finding ways to be thrifty in other ways.