I think that Canon's quality has already slipped. The last 2 "L" lenses that I bought had to be sent back for calibration out of the box because they were not sharp.
Furthermore, with all of the reported issues with focusing on the latest 1D MkIII, I held off buy the new 1Ds MkIII. Based on complaints of similar issues that I've seen posted on these boards and elsewhere, it sounds like there have been similar problems with the 1Ds MkIII, so I'm glad I waited.
I'm a firm Canon fan since my first 35mm camera in high school (1973). It was a Canon FTb. But, with the obsolescence cycle of today's DSLRs, I cannot help but be concerned that random quality issues are becoming a fact of life with today's products. That said, I'm sticking with today's technology, because I'm not going back to film ever.
Bud James