Rifleman, you assume the judges who retire (or are medically disabled) will be from our side of the fence.
If Ginsburg is replaced, it won't affect things (from an RKBA perspective).
Justices tend to try to avoid retiring when they think they will be replaced by those who would undo their decisions.
Just pray for the health of those Justices you would not want replaced by the current administration. Unless you are an atheist, in which case just keep your fingers crossed.