In the CPU mining days when GPU software was just being developed, there wasn't much talk of the price going down, or that it would be bad for bitcoin. Why is it different this time?
Video cards have value outside of bitcoin. low risk of lost investment if bitcoin plummets. With BFL, i suspect people will want to get their money out of the hardware asap... but im sure some of them are in for the long haul.
For a lot of people getting their money means getting bitcoins.