From what I've been reading, we have no idea of how many of these they're selling.
I doubt they are selling enough to significantly cut into availability for those buying the multi-pass.
We are planning a trip in either spring or fall of 2027 for a group of 10 and we may do the multi or single passes but definitely not the Premier Pass.
I would love to know to what extent these sellouts in PP affect multi availability and LL lines in general but it's difficult to get that info on this site without reading through the plethora of nonsense posted by two or three people.
Maybe the TOS should prohibit "posting just to hear oneself talk."
I wonder if it isn't partly other way around. I wonder if WDW also stops offering LLPP once they sell a certain amount of LLMP's.
They could easily toggle both LLMP or LLPP sales on any given day if demand suggests toggling LLPP down is a better strategy.
Or the weather will be stormy.
If WDW was not able to offer LLMP to onsite guests, their customers would not be happy. Similarly, I would think they want to be able to offer LLMP to offsite guests at the 3-day mark. (It is reasonable if passes sell out at the 1-day mark.)
Then again, WDW also always has the ability to add more park hours. Once upon a time, that's what they did when it looked like the parks were going to be busy, esp MK and AK.
I've been to WDW over many holiday weeks. Pre-pandemic, they often added park hours at 2 weeks out, sometimes less. It was quite common for WDW to add (last minute) EMH over holiday weeks.
Right now, ride capacity is also bit choked: BTMRR, RoRC, Buzz, Dinoland, resort rehabs, etc. Hopefully, that will improve before your spring/fall 2027 visit.
(I would like to see WDW revert back to having more EMH hours during holiday weeks that are available to all onsite guests. Over major weeks like Easter, MK had morning EMH every day for a full hour, plus sometimes bonus PM EMH. MK would often be open from 7:30am until midnight, and often later.
To address your other question: I've seen some wild swings in attraction availability. Slow days don't always translate into more LLMP availability. It is almost the opposite. On what were a very slow days at Epcot, where most attractions were walk-on, obtaining additional LLMP bookings (beyond pre-books) was limited: none for TT, Rat, or FEA. Even getting LLMP for the walk-on rides is often limited considering the waits are 5min or less.
(If at 11am, Nemo s walk-on, there is usually no reason/benefit to book a 3pm LL, esp if I am already near the Living Seas.)
Where LLMP has added value though is with park hopping. With park hopping, LLMP offers a MUCH higher value over anyone who spends all day in 1 park.
Neither LLMP or LLPP allows re-rides.
But with LLMP, you can book ANY LL that is available in ANY of the other 3 parks. Park hopping doubles the value of LLMP.
Always too, the actual value of either comes for what your group is actually in the parks to do. If anyone doesn't feel up to park touring, or rides are down, then LLMP/LLPP can be a total waste. Both products are a gamble.