Important point regarding SCOTUS nominees: there’s no requirement for all the seats to be filled. Assuming Ginsburg leaves first, a GOP Senate could sit on any replacement for her and one of Scalia, Kennedy or Thomas’ seats and there’d still be a Conservative majority. It would just be 4/3 rather than 5/4.
Could. Should. Won't.
I have no faith in the backbones of most of the RINOs in the Senate. Historically, Democrats vote against conservative nominees. Republicans rubber stamp even the most far left wing liberal nominees.