You clearly know nothing about Frank Lloyd Wright or architecture. Falling Water is not in Wisconsin, but Pennsylvania.

Falling Water was saved because it is the single most significant residential design of the 20th Century. There's not an architectural school in the entire world that doesn't teach that. Pick up any text book. There it is. http://www.home-designing.com/2009/10/live-in-falling-water-frank-lloyd-wrights-masterpiece

Older buildings, like cars, need regular maintenance. Even with that, they'll need an overhaul after an extended period.

The notion that older buildings are not energy efficient is bogus. Existing windows, roofs, walls and floors with proper work can be made much efficient than anything built now. The materials in older buildings with their dense clear wood and superior craftsmanship can't be matched today. LEED standards have been re evaluated to consider that, as well as considering the embodied energy contained within an existing buildings. http://www.wbdg.org/resources/sustainable_hp.php

It's a shame we live in a world with an attitude everything is disposable. Great buildings should be regarded no differently than the great music, paintings or sculptures. To be cared for and preserved for all generations to learn from and enjoy. http://blog.tmsarchitects.com/inspirations/the-importance-of-preserving-historical-buildings/

Frank Lloyd Wright stands among the greatest artists of all time. This isn't disputed in the world of architecture or art. Try looking at Ken Burns documentary on Wright. The film interviews just about every renown expert on the subject.