This is what I'm thinking. Like nuclear power plant disasters, they aren't all that bad for nature. Nature will LOVE reclaiming them, but are they the solution for you and me?
Today they are for the rich, absolutely. Tomorrow they'll be for those of us who don't mind all the problems they'll have(mostly plumbing, leaks, and some structural issues, I imagine). Oh, and the cities trying to condemn them. The cities are way to happy to condemn structures that people(squatters, and why not?) are perfectly happy to live in.