I disagree. My feeling is that any ride that *would* be so popular as to have late afternoon return times in the early morning will be a paid LL (LL$ I like that designation. Good way to distinguish from regular LL).
Back in the Paper FP days, TSMM was the ride that went nutso in the morning with all FP distributed by 11AM. I think in Epcot, Test Track and Soarin' might have had popular distribution too, but nothing compared to TSMM. I'm trying to remember if MK had any Paper FP that went super quick.
Of course, the flip side is that when you remove the top two rides from
Genie+ and make them LL$, something else will be the most popular Genie+. In MK there is enough spread out that I don't forsee a problem. Epcot, DS and AK have a dearth of Genie+ options that might cause a concentration, but I also think Genie+ uptake will be smaller in those parks as well.
I'm excited to see what will happen. Is this what watching NASCAR is like?