Look, if SCOTUS bends the knee to Trump here it will be the end of any claim to legitimacy. The calls for reform will drown out everything else.
More to the point, while they may owe him for their place, I only see maybe 2 on the Court who'd be willing to bow to Trump. They're all very proud people who have no repercussions in their life for whatever choice they make. Just because they kissed his ass to get there does not mean they're going to do a damn thing for him now. They answer to a higher power. The Federalist Society.