Unless he's blackmailing five of them, why do they care if they piss him off? They're in their jobs for life. And I assure you they don't want to be seen as the court that let the executive branch run roughshod over the judicial branch. I already went back and walked everyone through US vs. Nixon where the precedent related to executive privelege was in part established. That was a court with three justices appointed by Nixon that ruled against Nixon 8-0 (since Rehnquist recused himself) with everyone knowing it meant the end to Nixon's presidency and possible national chaos with the first President likely to be impeached/convicted. I can't imagine they won't grant this cert and rule against Trump.