You're actually closer to being right than you may have expected, or intended.
I tend to think that the court's members find their own place within the Court, and can even shift positions dramatically. I truly believe that if you put 9 carbon copies of Alito on the court, or 9 carbon copies of RBG on the court, those nine members wouldn't think in lock step. You'd see some of them shift.
So, if say Thomas or Alito or Kavanaugh or others end up leaving the court during a Democratic administration, or even if it's all of them, you won't see me coming here raising worries or clutching pearls. I really won't. There is enough legal precedent out there that I don't see the Court making broad swings one way or the other, regardless of its make up.