RBG would have to die in order for that seat to filled. Otherwise, she can be MIA for as long as she likes or needs to, and I see little being done to un-seat her during that time.
I think it will need to be "proven" that she is dead before there is consideration for Trump to fill the seat.
Everybody dies eventually. RBG has a terminal cancer and will probably go this year.
Put me down for April 1st in the betting pool.
She is 85. She has cancer. She is going to pass on sooner rather than later.