More Words, Deeper Hole

If the Dems win the White House, I don't see Republicans holding control of the Senate. If they have the Vice President, the Dems only need to pick up four seats to take control (five if Sanders wins), which is entirely doable in a Presidential year.

But even if the Republicans retain control of the Senate while losing the White House, I don't think the Justices would sit quietly if half the Court goes empty. That would nearly double the remaining Justices' workload as they have to write more opinions and supervise more Circuit Courts. No matter how ideological they are (and remember, most of them try not to be openly), at some point they'll start demanding that Congress do its duty and confirm a qualified candidate.