Okay, let's move out of Epcot then and use your examples for the other parks.
HS: RnRC, okay. But ST and ToT? I have vivid memories as recent as last week walking into the ST FP queue at the same time another guest entered the SB queue, and they got in line in front of me because I had to stop at the 2nd reader. ToT? Most times in the evening we could catch it with a 15 minute SB wait. So what is your net gain in HS? One FP ride on RnRC.
AK: Seriously never needed FP in that park before, and it isn't one that you are going to show up to at 8pm on a Friday evening, so I don't really think it's relevant.
MK: Again, the most popular attractions in this park are fortunately also high capacity rides - with the exception (for now) of 7DMT. Which also helps explain why this park does not suffer from tiering. So on MOST nights, walking into MK and being able to ride BTMR or SM with one FP for each might save you a total of: 45-60 minutes? Great! But you'll now find yourself spending that much time in line to do anything else you may want to do. Oh, wait - you say you have an FP for 7DMT? Well, if you got it that day then obviously you didn't need FP for anything that night because there must not be anyone there. Besides, I think the popularity of that particular attraction will soon wane just like it did for Under the Sea, which now has 10 minute wait times even on heavy park days. We were at WDW for 15 days and only rode 7DMT once even though we had FP's for several days. It just didn't do anything for us.
Look at MK another way - I can walk into that park tomorrow night if I want to and I'll be able to do Hall of Presidents, Country Bear Jamboree, Carousel of Progress, Mickey's Philharmagic and maybe even People Mover with minimal waits. WITHOUT an FP. You are probably about excited with that as I am you get to go play golf and ride SM once with an FP
Like I said before, and I'll use MK as an example this time - I don't disagree it's nice to be able to walk into MK at 7pm and knock out SM, then HM, then BTMR. We did it several times last week and the week before. But once we knocked them out, then what? All we were left with were the ones I mentioned above, because everything else had 45-60 minute waits because a bunch of other people had FP's for them too! Not to mention that in years past during that time of the year, many nights we would still be able to pull FP's for SM and BTMR. Didn't need them for HM because HM didn't have them!
I'd expect much more bang for the buck for $2B.