Ok.. there's a lot of misinformation and some correct information and it's all mixed together in here..
To Summarize:
When Disney prepares a promo -- like
FREE DINING or BUY 4 GET 3 or whatever.. they do it based on the room AVAILABILITY.. (unbooked rooms) not based on how many of the already booked rooms they *think* will wanna convert to the promo.
SO.. when everyone 'en masse' books during the expected Free Dining window.. (before the promo is released)...
that in and of itself reduces the amount of rooms that Disney is likely to offer on the promo and/or may reduce the actual 'travel window dates' for the promo.
Add to that, this overall reduces the effectiveness of the promo. All the rack rate rooms given up by guests converting to the promo will often sit empty ...
Now.. in MANY cases.. people are able to convert an existing reservation to a 'promo' provided that there is availability in the resort/room category they already have booked and during the dates they have booked.
But many many many other people have to change their dates and/or resort and/or room category to get the promo.
Note -- there are THREE different factors there.. Dates/Resort/Room Category.
For those who have to change their reservation - what benefit did they receive for booking the reservation before the promo? None.
Booking the 'exact' resort you want ... just to book ADR's.. does allow you to book your ADRs a few days earlier than otherwise ..
but ... it REDUCES the amount of inventory available for the promo.
And even worse.. it reduces the inventory of rooms/category at the EXACT resort you MUST have. See the problem?
Why? Two reasons..
1. Disney has no way of knowing for sure that you intend to switch your reservation to Free Dining. Oh sure they can make a reasonable guess... But that's just it. It's a guess. If they had a true picture of how many empty rooms they REALLY have for those travel dates, the promo could be longer and include more resorts and room categories.
2. Because when you convert your non-promo reservation to the 'promo' ... the room you just gave up does NOT get dropped into the promo inventory automatically.
It goes back to the rack rate inventory.
The advice I *always* give on this is exactly the same..
*If* you have no intention of going without the free dining promo -- then there is zero benefit to booking before the promo is released. None. Nada. Zilch. In fact, in that scenario... you're probably just shooting yourself and others in the foot a bit.
If your exact three choices (dates/resort/roomcategory) aren't available.. OR you decide not to go OR have to change your dates/resort/room category ...
Then all the tenative reservations are just messing up the math for the folks assigning rooms to the promo and your ADR's are just cluttering up the system possibly blocking others who ARE sure of their trips, dates, and resort/room category (regardless of F/D or whatever the promo is)
Honestly, I think the whole panic over ADR's and all that is a bit overblown.
Yes, there have been situations in the past where folks waited way too late to make their ADR's and were shut out of a lot of different places... but when the promo is typically released in April there are STILL plenty of choices available ..
Booking before a Promo is released guarantees you NOTHING but your ADRs. And really truthfully only by a FEW DAYS than someone staying completely off site. In otherwords, you can make your ADRs without a reservation at 180 days.. and those onsite can book 180 + 10.
Personally, I think it's a complete waste of time to make a reservation JUST for ADR's on the HOPE of Free Dining.
All it does is reduce the number of rooms available on the promo and mess up the dining reservations system with a bunch of stuff that is more than likely to change later. It's simple math.
--
I know there will be a flurry of posts saying
"But I converted my reservation to the promo no problem.." -- yes.. it's happened that way lots of times.
BUT.. if you know and understand the math that's involved in 'game theory' and how the behavior of large numbers of people individually affect the group as a whole... then the argument for NOT booking before the promo to show Disney the TRUE number of empty rooms is pretty clear.
Everyone says the same thing "I only booked one room what difference will that make?" - None. But you and thousands of others are doing the exact same thing and is the effects of individual actions on the group as a whole that reduces the room inventory for a promo like free dining.
And I write
ALL of this with some knowledge of the huge number of ADR's made months and months before ... that go unused during the F/D promo ... thus blocking other guests from enjoying that eatery.
It's a way bigger problem than most of us think.