According to Nikkei Business Daily, Capcom is planning on reducing software support for Gamecube in favor of PS2 and Xbox. The reason cited was "poor sales" of Gamecube hardware world-wide. In addition, the exclusivity of the Resident Evil series on the Gamecube will come to an end after Resident Evil 4.
I have to say that, honestly, I couldn't care less. I haven't enjoyed RE in years and nothing else Capcom has developed for Gamecube has piqued my interest...
A second thought - maybe if the mother fuckers would produce something GOOD for the platform then they would see results. Capcom's attitude comes off as (at least to me): "nobody is buying the INCREDIBLE CRAP we release for Gamecube so we're going to desist support for it."