weeeellllll... you see the problem with expanding anything in the MK is that there's not really any "free space" to do it in. now, before you get upset and tell me that that's why they built WDW in the middle of nowhere (originally...), follow me through.
just outside what you can see at MK are dozens of buildings, storage buildings, and access roads - access roads that serve an important purpose and cannot be just have an attraction "plopped in". on my way to work I pass the 20K show building (the part that's above ground, anyway). if the bus window were open I could touch it. there ain't a lot of room there, so the idea of putting anything "behind" Fantasyland is encumbered by the fact there there's a good 30 foot drop behind Fantasyland to the ground bel;ow and behind it.
unless they tear out the Speedway (a good idea, IMO), there's just plain no room back there.
the place we COULD build is at the edge of Adventureland. I can't imagine it being too difficult to build around the parade barns and whatnot back there. but we would have space for only one large attraction. large being, well, about the size of Splash Mt. see? it's that Train that's holding us up. =)
I have what I believe is a sensible idea. being a native Yank myself, Liberty Square has never "boded" well in my mind. it goes from Colonial Virginia to a more Northeast type of structure in a few feet, and is topped by the very Hudson Valley HM. Here's my idea...
Knock out the Columbia Harbor House. I've never seen it filled even at peak season, and it's a huge chunk of real estate. put in an indoor / outdoor, 2 level dark ride attraction based on Ichabod Crane and the Headless Horseman. with ramps and drops and some nice effects.
then, theme that whole northern end of Liberty Square to Massachusets / New York in the fall. carts full of pumpkins, rickety scarecrows. and - if they can do it - bright orange fall trees. a real Halloween feel, with flickering Lack O' Lanterns lit up at night.
this will A: Unifify Liberty Square into a cohesive whole and provide a good "fix" for this end of the park.
B: provide a much more satifying "buffer" between LS and Fantasyland.
C: give Imagineering an excuse to do some Nightmare Before X-Mas stuff and hopefully bring in HMH.
I also think the former Fantasyland Skyway building could house a beautiful, classy sit-down Restaraunt. except for Cinderella's Banquet Table (or whatever the hell they call it now), WDW has no relaxing place to enjoy a quality meal (Cindy does not qualify; it's overrun with prepubsecant girls).
whew... I'm done. =)