That's kind of my point (and also exactly what I said regarding Universal's deluxe hotels).
It's different for Disney, because Disney has offered FastPasses for free and guests are used to having that as an option. Universal only had a free offering for a pretty short period of time; not long enough for people to expect it as part of their vacation. If FastPasses go away entirely and the paid upcharge is the only option, there are going to be a lot of guests who want it because they've become too used to having FastPasses. If you have to spend $250 a night to stay at a value with no express pass offering, or could stay elsewhere for $300 a night including both your accommodations and an express pass, I think a lot of people would go for #2.
However, and it's a big however, that will depend on how the system works. If you have two adults and two kids, and you have to pay for each individually, that's a gigantic expense increase and you can throw what I just said out of the window. At Universal everyone in the room gets one (I think -- I know we both received one without having to pay anything extra, but it could be limited to two per room or something like that), but I don't know how they price it out for families otherwise. There's obviously a huge difference between paying $150-200 for your whole family per night and paying $150-200 for each individual.
At Universal, everyone in the room gets the pass (just the older deluxe hotels). Notably, they have never included it in a benefit with any of their newer hotels -- which are sometimes nicer than the old hotels. I believe it may be part of a contract with the older hotels. And the benefit is definitely built into the pricing.
Now, assume Disney did follow the Uni model:
Uni has a "limited" Express Pass that starts at $60 per person per day. An unlimited starts at $90 per day. During peak periods, it's much higher. During peak periods, it goes at high as $150 per day.
Now, take a Disney family of 4: If they are the type of family that stays at a value resort, they aren't the type that are going to buy an Express Pass add on, whether they stay onsite or off-site.
If a value on-site room is $200.... and they can stay off-site for $100..
Adding between $240 and $600 per day for express pass becomes a forbidding expense, whether they stay off-site or on-site. Such a family might now be incentivized to stay on-site -- to at least get the 30 minute early entry, since they would never pay $240-$600 per day for express passes!
Now, look at a deluxe guest who often pays $500-$700 per night for an on-site room. They would be even more incentivized to stay on-site. Sure, they can get a deluxe quality room off-site for $200-$300... but paying an extra $200 to $400 could be considered a "bargain" to get the express passes.
Returning to the value guest.....
Which would be better:
Offsite with express passes for a family of 4, for $500 per night.. (and no early entry)..
Or stay onsite in a value, family of 4, $200.. and get early entry.
While some families would pick the first option, I suspect plenty would still pick the on-site option. It would also really encourage families to upgrade to deluxe, if the EP was included with deluxe. (I can stay on-site, Deluxe, get EP, for the same price as staying in a flea bag off property with EP)