My kids would love a
DVC in TOon TOwn... they would think it was way cool to sleep in Minnie-Mouse sized beds! Or a bonk in Donald's Boat... (it's not like they use it to have FUN in anymore, since the water's been off since 1998, I think!)
For me, I'm happy with the resorts we have, but I'd like a monorail to VB. I might actually visit there, if I could leave the driving to someone else! I would like another off-site DVC resort (big pipe dream, but you said think big!) I'd like a mountain resort, like the Greenbrier -- a change of pace from the beach resorts. With all sorts of activities (winter sports, summer boating / hiking, spa, kid's programs, etc.) Do it up Disney style (and make it near WV, please!!

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I like the Train idea... very "WALT", too, with his love of the rails. I think he'd approve.
I think if we inhabit the TOT, they should put in a restaurant that does murder mystery dining (like Agatha's in Atlanta, but ala Disney style). Just think how this place would book up during
MNSSHP!
DH would love a DVC up-scale version of an All-Sports... with an ESPN restaurant in it... TVs everywhere, even in the bathrooms to watch your games while on "the go"... and special rates to events at WWS...
And for the points-bargain-conscious... maybe a resort that combines long long hallways, dumpster and parking lot views, poor housekeeping, all HC, bugs galore, and tiny, very un-OKW-like closet-style rooms... Zero dues for this resort as the incentive, since upkeep would be fairly nonexisitent!