Once again, John, nice work. Frankly, there are two reasons why the Republicans haven't done this yet...
1. I'm not sure all Republicans were on board with the nuclear option before (Snowe, Specter, Chafee, etc.)
2. Until this past election, I think some of them thought they might need to use the filibuster soon themselves. I think they wonder if, in the future, they become the minority, will they regret killing it.
Frankly, principle is principle. If you win the election, to the victor go the spoils. Just don't lose future elections...
By the way Mark Levin has discussed this too.
It's a matter of principle.
The President appoints judges subject to an up or down vote in the Senate, and both the President and the potential appointee deserve that and nothing more. This principle will serve us well regardless of the party in power in the Executive or holding the balance of power in the Senate.
And - it is the voters in the end who control who is President and who sits in the Senate.
If we want judges that will look to the Constitution to find Law, and not to some translation of a book by Wolfgang von Goethe, Friedrich Nietzsche, or some other European statist, ala Justice Breyer, then lets remember that it is we who decide, every time we vote.