The thing is, the filibuster doesn't promote bipartisanship, it blocks it. If a bill was going to pass no matter what, there is some chance some minority party people jump on with a few concessions. With 60 it's just cock blocked.
The filibuster as it stands today was invented like 11 years ago, I don't get why these dumbfucks act like it was handed down from the founding fathers (who actually, purposefully, made the Senate a majority vote house).
Also, how dumb do you have to be to unilaterally disarm? This is just telling the republicans they have nothing to fear, no reason to even attempt bipartisanship.