They'll never get a 2/3 majority for term limits for justices. There have been many calls for term limits for congress, but I've never been a fan. Back in the 70s and 80s my state (OHIO) had two excellent senators, Metzenbaum and John Glenn, both liberal Dems who worked hard for working class Ohioans. They both served for many years, Metz for 19 years and Glenn for 25, and Senators become more effective with tenure. In both cases when they retired they were replaced by Republicans. One of our current senators the other being JD Vance, Sherrod Brown, has done wonderful things for Ohio workers in his 17 years in office. All 3 of these are popular enough liberals to keep getting elected in a red state. Then we had Dennis Kucinich, universally recognized as the most liberal Representative in Congress. Repubs hated his guts but he won over and over again in a working-class district. They finally gerrymandered that district out from under him.
Now as to limiting the Supremes would you have wanted to put a limit on Warren or Thurgood Marshall or RBG?
After FDR won 4 elections Republicans couldn't wait to apply term limits on the presidency then wanted to get rid of them so they could give Reagan a third term.