When they adopt the rules at the beginning of the Congress the 3/5 cloture rule could be revised or eliminated. However, what goes around comes around. The GOP will not be able to hold onto the Senate for ever. If the Senate reduces the margin, it will stay reduced and keep the GOP from being able to filibuster when they return to the minority. I can't see the GOP beng so reckless as to eliminate the filibuster. Lowering the margin is possible tho. At one time it took a 2/3 majority to cut off debate.
4/7 = 58
5/9 = 56
6/11 =55
If I remember correctly the Senate, unlike the House, doesn't vote on its rules every two years, but only when one side is pushing for a change (wrote a paper on this once). Anyways, it would be impossible to force cloture on a vote to abolish cloture. You'd never get the 60 votes needed.
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