I don't think that reservation date-based requests would have any grand impact on guest satisfaction. Two reasons:
Reason #1: I think most folks over-estimate the number of rooms available that meet their (often overly restrictive) requests. Let's look at BWV Standard View for example:
There are 97 dedicated studios and 149 lockoffs at BWV. Let's assume that half of the lockoffs are reserved as part of a 2B, leaving us with 171 studios (74+97).
Only 20% of the rooms at BWV are Standard View, taking us down to 34 rooms (171*.2)
Let's assume that roughly 15% are either smoking-optional or handicapped. Now we're down to 27 rooms (34*.85)
Want a "high floor"? Now you're limiting yourself to only 20-40% of 27 rooms. Want to be "near the elevator" or some other geographic location, again a smaller block of rooms.
And we haven't even talked about how many rooms are actually vacant on any given day. If traffic patterns were consistent throughout the week (which we all know they aren't) there could be as few as 3 or 4 non-smoking, non-handicapped, standard view studios vacant on any given day (27/7, assuming an average 7-day stay.)
At the smaller resorts, this is a huge issue. There are only 25 2Bs at BCV with the two queens in the second room. There are only 7 Grand Villas at BWV. There are a limited number of both Standard View and Boardwalk View rooms at BWV. And, the tiny 136 unit property called VWL has everything in short supply.
If 10 BCV owners called 10-11 mos out to book an "Epcot view" 2B, and only 3 vacant rooms fit that criteria on the check-in date, 7 families are going to be demanding to know why their request wasn't met when the booked so far in advance.
Reason #2: The "screamer" factor. Until Disney CMs learn to take a hard line with the front desk screamers (and their close cousins who "politely" climb the org chart at the resort until they find someone willing to acquiesce), reservations will still get shuffled on check-in day, requests be damned.
Imagine you called two hours after MS opened at exactly 11 mos and requested your ideal room. Unfortunately you are one of the last guests to check-in on your arrival day. In the meantime, a "screamer" who booked 3 weeks ago hates his / her room (smoking, handicapped, view, etc.) and demands a change. Guess which room he / she gets moved to? More imporantly, guess which room YOU get stuck in despite booking 11 mos ahead?
While this may sound like an obscure scenario, I'm convinced it happens ALL THE TIME. Read between the lines of the trip reports here. Pay attention to how many times people request changes to their assigned room. Understand that when rooms are pre-assigned, in theory the best attempt was made to satisfy all guests based upon the vacancies available any given day. Make one change after pre-assignment and you better believe someone else is impacted.
I won't go so far as to say that people are wrong for requesting a change, rather the resort is 100% at fault for GRANTING the change. And all of those advocating an assignment system based upon something like booking date need to realize that doing so would likely strip the front desk staff of ANY and ALL flexibility. The system would only succeed if rooms were properly pre-assigned with zero changes permitted after-the-fact.
Who really thinks that's realistic?