I think it comes down to this: Frist had only 49 solid votes to go nuclear. He, and the rest of the causus, were at the mercy of a few Republicans who are both mentally and morally challenged. But Frist should now threaten the "moderates" with the loss of leadership positions on committees if the Dems bring forward the filibuster on any future nominees.
I think there will be a few moving to basement closets...