I just don't see it. DL is a locals / shorter trip kind of place. When people go, they try to maximize park time, so getting there early isn't a problem.One word: Maxpass
With WDW, there is so much more to do. It's not just about the parks. MaxPass would penalize those who want golf in the morning, or sleep in after a late night, or hit a water park, or have a late breakfast, etc.
Paying for the right to participate in a first come, first served program at WDW is a square peg, round hole type scenario.
Of course, this is just my opinion and I am fully aware I could be 100% wrong.