This got me thinking- what should actually never be removed? I think the big landmarks- the castle, Matterhorn, Splash Mountain, Space Mountain, Columbia, Mark Twain, the Main Street facades, and the Haunted Mansion facade should never have their exteriors altered. The interiors should be updated faithfully as needed. The Jungle Cruise should also never be altered to include an IP or something. We don't need a "Jungle Book Cruise".
I'd scrap Toontown, half of the autopia, the Submarine voyage, gut all of the Tomorrowland buildings (minus Space Mountain) and build new attractions that are unique.
My biggest fear is that today's Disney is incapable of building "classics" and that most of what has been built in the last 25 years won't be here 25 years from now. I mean, the ToT was as "classic" as you could get at DCA, and they decided to paint it gold and alter its story (Space Mountain '98 anyone?)