Good point. To build on that here's something I thought of when trying (but most likely not succeeding) to model/steelman Eliezer's thoughts at the time of his decision:

This basilisk is clearly bullshit, but there's a small (and maybe not vanishingly small) chance that with enough discussion people can come up with a sequence of "improved" basilisks that suffer from less and less obvious flaws until we end up with one worth taking seriously. It's probably better to just nip this one in the bud. Also, creating and debunking all these basilisks would be a huge waste of time.

At least Eliezer's move has focused all attention on the current (and easily debunked) basilisk, and it has made it sufficiently low-status to try and think of a better one. So in this sense it could even be called a success.