Obama should have forced RBG to retire in 2013. He should have kept bugging her about retiring until she gave up and did so.
Wouldn't it be seen as an affront, if a prez tries to push a SCOTUS justice into retirement? Of course, Mr. Trump wouldn't care, but such a norm breaking would backfire against a traditional prez.
RBG made a huge misscalculation because she anticipated HRC, who recommended her appointment to her husband, would be elected in 2016 and replace her.
What an idiot she was to take such a huge risk, even without the benefit of hindsight Hillary was not inevitable enough to be worth risking a 6-3 Court.