If they were threatened, they should discreetly communicate with President Trump immediately.
SCOTUS’s independence as an institution was openly threatened by the Democrats in the preceding months, precisely to scare the justices away from resolving this issue. It wasn’t so long ago that Chuck Schumer called out justices by name to a rage rally gathered in front of the Capitol.
The threats are there, and the sword of Damocles hangs precipitously over this institution just as over all other institutions.
The sword will fall, of course. As the nation progresses toward its ultimate end, all constitutional loopholes will eventually be exploited. A lack of courage to exercise Constitutional power will only hasten this process, not slow it down.