The Commanche was not a replacement for the Apache. It was a replacement for the aging, and ad-hoc, Kiowa scout helicopter (basically a Bell Jet Ranger (or equivalent) with radar and some weapons stuck on it). Seems like kind of a dumb move to me. The reason is probably far more political in nature than technical in nature.
The Commanche is all the a Army Aviation community has talked about for the past 20 years. It was supposed to the poo!!!. It has been in developement my entire aviaton career. I am going to be sad to see it go. Heck maybe it will end up in the Army Aviation Museum in Ft. Rucker, Al.