This Congress is only 1/4th of the way through.
Doesn't matter. The dems will hold out for the next Congress in the hope of picking up seats. Their base will demand it. They will listen to their base. The RINO negotiators will keep their word and oppose changing the rules of the senate. No vote on SCOTUS nominee this Congress.
With enough fillibustering the Democrats can either keep Bush from having an appointment to the S.C. and save Rehnquist's replacement for Hillary to appoint, or they can cave when Bush comes out with his "Souter."