I agree with that. However in the short term the price dropping means somebody or some group of people suddenly decided to unload a substantial amount of Bitcoin. Assuming that this is not some large holder dumping a bunch of coins to purposely lower price isn't it feasible that the BFL asics shipping triggered some sort of sell off from existing GPU miners who were just hanging on until asics shipped?
It was only a passing thought as I've, and I'm sure most of us, have been following BFL for a while now and they've only started shipping in quantities in the last 2-3 weeks.
Mmm, this is a really hard one. While that is definitely a possibility, another idea I saw the other day (that I think is likely more plausible) is that it has to do with the recouping of funds used to purchase the asics. People have had their money out of their pocket for a year or more with absolutely nothing to show for it, so this could be their way of trying to get financially back up again.
Also, keep in mind that something we see (at least in games, but I think it should apply here?) is that if one person drops their price, by say 10%, someone else will as well. It turns into people undercutting each other, lowering the prices until someone (or a group) manages to buy the wall back up again.