I'm kind of interested in this, but these numbers just don't seem right, I could be wrong, but they seem kind of high. I would be curious how the OP arrived at these.
I'll just try and break it down for Magic Kingdom.
The average daily attendance at MK for 2011 was around 32,500, based on THEA's estimate of 17.14 million guests.
Based on travel estimates, Disney hotels average about 80-82% occupancy rates in their 27,790 rooms, which (if my math is correct), means that roughly 22,500 rooms are filled with an average of 2.8 guests per room.
Estimated no. of guests at MK in 2011: 17,000,000
Average per day: 46,500
Number of Disney owned hotel rooms: 27,790
Average occupancy : 81%
Average no. of rooms occupied: 22,500
Average no. of guests per room: 2.8
Average no. of guests in Disney hotel rooms: 63,000
Estimate of guests from Disney hotel rooms in MK: 17,000 (Avg of hotel guests / 4 parks, inflated for most popular park)
So, we can guesstimate that roughly 17,000 people who are staying in a Disney owned hotel, will be in MK on a given day, and using FP+.
The way Disney would appear to be running the FP+ program is similar to the way they did the Million Dreams FastPass giveaways. Basically, they give you the option of allocating or using a Fastpass on one E-ticket, one or two C/D tickets, then one or two A-C tickets. You would have a total of 4 Fastpasses you could use, but they're broken down by the attraction type. Higher value attractions, which are higher demand, are limited to just one, or maybe two on rare occasions.
This would mean, those 17,000 guests, would potentially be acquiring 68,000 FP+s (4 * 17,000), but, they're still only going to be able to use 1 FP+ each for 1 one of the top attractions. Let's just say the following attractions are category 1 (D/E):
- Space Mountain
- Splash Mountain
- Big Thunder Mountain Railroad
- Mickey's Philharmagic
- Buzz Lightyear's Space Ranger Spin
- Peter Pan's Flight
- Jungle Cruise
Advanced FP+s would average out to be 2400 per attraction, based on the above listed (potential) 17,000 guests each being able to acquire one of FP+ for one of these attraction. It's safe to assume that some would be higher than that, but probably not much more than 3,000. Most all of the attractions listed though have a daily capacity throughput of more than 10,000 in 8 hours, so, in theory, it shouldn't pose a huge issue.
Note: I'm not claiming that I know better than the OP, I'm just showing my own numbers based on what I've been able to find, and using my own math, which I will readily admit, might be inaccurate.