But then they vote. If there's quorum it's either talk, vote, or, at the discretion of the Chair, move on to other business. You can't say "I don't want to vote," and not debate or threaten debate (the non-filibuster filibuster I described earlier). It doesn't work that way.
That's exactly the way it worked for a bunch of judicial nominees. The question is how to use the rules to force a Senator to talk.