I can understand the Republican Party being optimistic about taking back the White House. Confidence is important. They shouldn't be overly presumptuous, though. There is a chance that there will be no Trump presidency.
Just to throw more cold water on their dreams, they might not hold the Senate come January. They have 24 seats they're defending and the Democrats have 10. I could be wrong, but I don't believe Trump's coattails are going to be long enough to hold their majority. Their best bet may be having the opportunity to vote on the nominee that President Obama puts up.
Personally, I think it would be swell if the vote is held off. Roll the dice. My dream is of Bernie or Hillary nominating Barack Obama for the Supreme Court with a Democratic Senate. But then, one man's pipe dream is another's nightmare.