Hard times and building in Chicago

Being a geeky urbanist, it pleases me to see construction cranes downtown and old industrial buildings being rehabbed as condos (though for the time being they are FAR beyond my price range). However, with the economy in the state that it is currently in how long can this growth sustain itself? Are there enough buyers to fill the condo suites in the yet-unfinished Trump Tower? How about in the Chicago Spire, which has not gone past the foundation stage? The latter project has begun to recruit potential buyers from as far as Singapore. Is everything going to turn all right or will Chicagoans grow accustomed to half-built skyscrapers and great projects that never were? Time will tell.