Maybe I wasn't clear, but the discrepancy between 4x and 8x is already starting to have an effect on the upper echelon of cards. If the R42X and NV40 are as good as promised, there is no way they will run as fast as they should on a 4x board. Therefore, there is little reason to wait for the next-gen cards since there will be little (especially for the money and wait) added performance (I, too, have 4x AGP and want to upgrade to a 9800XT, which is about as fast as a card that I will ever get to run as well as it should in the slot). Also, the PCI-EX cards will include an adapter to AGP initially, but no company has said whether or not that adapter will work on a 4x slot. Chances are that anybody who will be buying a R42X will already have a kickass/very modern computer, which will include an 8x slot--meaning that there will be little reason for ATi and nVidia to make their adapters compatible with 4x.
RDRAM = (ENEMY)^2