i dunno, maybe because after 2 new architectures, the competing product, which sits on a 3 year old arch, is still relevant?
and imo, we have enough bottom-to-middle class cards in the market already from both camps. and a top-end single gpu monster will be a spectacle come this summer's annual gpu superbowl.
anyway, the slides, they got it wrong though. the 9800gt featured a process shrink as well.