The US Supreme Court is enshrined by laws as the heights judicial court in the country.
Eventually the matter of trump’s elegibility is going to wind up before it. Your choice at that point is to either accept its authority- even if they’re corrupt assholes who have no business having power; or over throwing the lawful government.
Republicans would simply ignore the court (as they have in the past- in this context they’re the enemy we’d become.).
Note, I’m not advocating an insurrection, either (and become more like them.) but I do see the US as walking a dark path… and I’m scared and impotent.