I'm just going to sell my cards for as much as or a little less than I bought them for. I bought them used and worked out how much they'd make before the block halving/ASIC hit, so I have no qualms about just selling them off and taking my profit.

Of course, if the ASIC thing doesn't pull though how it's expected to or somehow GPU mining is still even a little bit relevant, I'll just keep mining away. Having free electricity helps!