There is an interesting article in the Washington Post presenting the case for a situation in which a President may go ahead and appoint a Supreme Court nominee.
Essentially, it says that an argument can be made that a Congress that refuses to advise and consent abandons its responsibility and, therefore, any censure.
Fascinating argument.
Why was it okay for Obama to filibuster Alito?
White House: Obama 'regrets' his filibuster of Supreme ...
Democrats started the downward spiral of the confirmation process with Bork.
That said- both Democrats and Republicans have enthusiastically embraced politicizing the confirmation process into the circus it is ever since Bork.
The current Senate's refusal to even pretend to consider confirmation is just the ultimate expression of the politicization.
What will the Senate do next?
Probably we will get to the point where regardless of the nominee, the party opposite the President will emulate McConnell and just refuse to hold any confirmation hearings until a President of their own party is elected.