The GOP is not going to allow Obama to get a nominee through. McConnell has said NO HEARINGS and with no hearings there can be no vote. This is totally within his authority to refuse to advise or consent to a Presidential appointment. It is unclear what the fear is that would prevent the GOP from going through the process of following the Constitutional methodology of letting Obama submit and name, evaluate his or her fitness and voting. The GOP can keep the seat open by voting NO on the person if they have good reason. Do this a couple times and we are to the next President.
And if that next President is a Democrat and the GOP holds the Senate do they just let it stay vacant? Should a political party refuse to accept a nominee who is qualified but differs in Constitutional interpretation from the dogma of that party? If under the next Democratic president 2 or 3 more justices die or retire do those seats also go unfilled?
If the "election" results should be awaited before a nominee can be considered does that apply to all elections where the Senate or the Presidency is in play? Should any vacancy in 2018 be stonewalled pending the Senate elections that year? Where does this end?
If the Democrats retake the Senate in 2016 and the GOP wins the Presidency does that mean that the Dems should block any new nominee as the voters have spoken by electing Democrats who surely are going to be running on the SCOTUS issue?