I doubt that the every GOP justice would want to throw away their credibility, future, and gravitas for the congressional GOP. And before anyone says "of course they will, they're GOP justices!", we've already seen Republican justices go against the party when it comes to gerrymandering all the time, from NC to OH to PA.
Whats more likely is just a rather bland, fair-ish map. Its not the gerrymander that the Dems could have made, but its at least a bit more kind to the Democrats than the current map.
In NC the case was decided on partisan lines and in PA it was one D judge joining the 2 Republican judges.
I was referring to
all of the court cases that have dealt with gerrymandering, such as ones that have faced superior courts, not just the ones that the supreme courts of each state have faced.