It is what it is, but since McConnell blew up Garland, the rule is now that a president of either party will never successfully nominate a justice while the other party holds the senate. There will have to be an election first "to let the people decide."
And if a Justice takes ill or feeble, while the party in opposition to the party of the president who nominated him/her, the justice will most likely continue to serve despite pain and feebleness.
What that will mean is a President needs a Senate if the same party to fill seats.
May take a decade for that to happen
The court will dwindle to 8,6,5 justices
May need to pack it just in case