It's funny because let's look at a 9800pro, which cost over 350 bucks when it first came out. Now, it's like in the hundred dollar section, except for a 9800xt256 (over rated), but then a 7800GTX will be a hundred bucks in a few years from now. How old is the 9700 ($400 USD @ 2002/2003?), that card is like snow flakes compared to a 7800GTX.
I'm pretty sure the 7K series isn't going to release an AGP version, if so, it'll probably be like the over priced PCI video cards that existed during AGP's flagship days, and still exist to this day actually.