Urban planning as seen in sci-fi

A very interesting article on the urban planning seen in Star Wars, Blade Runner and other sci-fi classics. Author Tony Chavira does a good job of examining what works, and doesn't work, in these various cityscapes. One aspect that I found a little strange was Chavira's assumption that there would be homeless people in all of these environments. Sure, there would be homeless folks in Star Wars' Mos Eisley or Futurama's New New York... But I have a hard time picturing people sleeping in alleys in the utopian world of The Jetsons. (Besides, they don't even have alleys!)