> To change this, we should require some kind of supermajority to confirm judicial appointments at all levels.

That was the de facto situation until 2013 (until 2017 for the Supreme Court).[1] The Republican SCOTUS majority became entrenched when Mitch McConnell refused to allow the Senate to consider Merrick Garland in early 2016, though. That wasn't luck.

[1]: https://en.wikipedia.org/wiki/Nuclear_option#2013:_Cloture_o...