As I noted in a post about a year ago, it’s hard to make a convincing case for the filibuster in the abstract. It’s not in the Constitution. It specifically was not contemplated by the Founding Fathers. It cuts off deliberation, rather than enhancing it. It makes reasonably bipartisan legislation impossible; something closer to absolute consensus is necessary. Finally, it effectively shifts power from a paralyzed Congress to the executive and the judicial system in a manner that was never contemplated by anyone, and which frustrates a large segment of the population. In the end, this leads to government by litigation and furry Vikings.
Why does Mitch McConnell love the filibuster? Because it doesn’t stop him from doing what he really loves when he’s in power: cutting taxes and confirming right-wing judges. It prevents the Reactionary faction in his own party from jamming through unpopular social legislation that would ultimately cost the GOP seats and the PBPs their tax cuts. So, of course he loves the filibuster.
Will it survive? For now, yes. In the long run, no, because the Reactionaries have more and more control of the GOP. My guess is that it will be buried by the extreme right, not the left.