I should clarify...
Actually, he did not tell me that they would not interview me. He called me from his house, to see (as jawurheemd suggested) why I wanted to go there. He asked me if my wife wanted to live in Chicago or I had family there, and basically seemed awestruck by the fact that I chose U of C for its merit (and the fact that Chicago would be a nice enough place to live). He indictated that my app was good enough to get an interview, but that U of C didn't want to waste its interview slots on applicants that weren't totally committed.
As far as my conversation with him, I do feel that he seemed rather abrupt and confrontational, which naturally makes me a little less interested in visiting U of C. On the other hand, I am sure that U of C is a top notch program, otherwise I wouldn't have applied in the first place. Oh well, such is life...