Remember, when Walt built Walt Disney World, he unfortunately didn't buy enough land. So when he decided 10 years later than he wanted to build Disneyland (though, unfortunately, he would not live to see it open), he mentioned that, "here in California, we have something we never enjoyed in Florida--the blessing of size." While cramped Walt Disney World is only able to replace old rides with new ones, in Anaheim, amongst miles upon miles of gator-infested orange groves, they will be able to build MMRR without replacing anything of substance, just like they did for SWGE, and will do for the Marvel E-ticket. Not possible in Florida. MMRR, SWGE, and the Marvel E-ticket simply had to replace something else as there was no space left.
Oh, to have acres upon acres of cheap real estate like they have in SoCal. Sigh. I just wish Walt had lived to see Disneyland. I think he'd love Finding Nemo Submarine Voyage and the Pixar Pal-a-Round. You can really *feel* Walt when you stroll through Dino-Rama in a way that simply isn't possible in Disneyland. But, we can unfortunately see sky-scrapers from the parks:
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