I still think it is the right thing to do and I personally am not afraid of what would happen to Bitcoin as software or to the network if such an influx of users and attention happened. Something is eventually going to break like that, so the Bitcoin community ought to be prepared for that eventuality. If this concrete example is somehow going to spur on developments that make Bitcoin more secure, it sounds like even the possibility that Wikileaks may use Bitcoins is a good thing. If not this particular incident, there will be something else like this which may eventually push Bitcoins into the limelight.
You reasoning is sound, but the cost and benefit is hard to determine. We don't have many people who really understand how bitcoin work, real deeply. So Satoshi would have to be fast on his toe.