I don’t think that we have anything to worry about. Even an ultra-liberal replacement will not change the ideological composition of the Court.
Same goes if Ginsburg retires ...
The one ya gotta watch is if one of the 4 conservatives or if Kennedy goes - THAT is the fight we want to win ...
They don’t have to filibuster, which they would not do anyway. What they need to do is expose any Obama nominee, and the exposition if done would be sufficient to force them from contention. But they won’t even expose such records and background. Don’t want to make waves, like GHWB said in his debate analyses.