well you can already get 8800gts 320mb cards for like $250 after rebate. if the 8600gts is $180-200 and the 8600gt is $130-150 street price, i dont see why they would drop it much omore. its not like AMD is coming out with anything competitive anymore, so why would nvidia drop prices just to give us a break.
i bet actually the 8800gts just stays where it is, until the 8900gs comes out (i think its 256bit bus, and natively 96 shaders with none disabled so smaller die too) comes out, and that will just take its place completely in the lineup so maybe then we can see a price drop.