I respectfully disagree. Not that they'll turn out to be right, but I think the liberal calculus is that they want to force the use of the nuclear option now, when they already know Gorsuch is going to be confirmed. They believe that will result either in a more moderate pick next time, or that they'll paint the Republicans as extremists and anti-women, and racist, if/when Trump names another conservative.
I can hear their arguments already, about how Trump got his conservative pick to replace Scalia, and that "it would only be fair" to name a Kennedy or Ginsberg replacement with a like-minded judge. The Dems will be doing their level best to flog this issue all the way to the mid-terms.
Paint away.
They do this as a matter of perpetual desperation.
Has nothing to do with any particular issue.
Libs can’t win on substance.