The Republicans will challenge the constitutionality of the "super majority" if they fillibuster. They are hoping to get it to where you only need a simple majority, 51 votes. It is likely to happen.
Nah, they are more likely to use the "Nuclear option" than change the filibuster rule.
They will raise a challenge that the filibuster is out of order. All it takes to support that is a straight up or down vote. It also leads to no permanent change.
Only down side is once the dems regain power they will likely make use of it too. Sort of a MAD for Senators.
Well, I would hope that Chaffee, Specter, Snowe, Collins, and possibly McCain would vote against this sort of nonsense. Any others? By my count that's 50/50 so I guess Cheney could break the tie and ruin the Senate.