I've heard the same wailing in the past, and I remember what happened in the mid-terms during Obama's first term. He had strong majorities in both houses of Congress, but the Pubbies retook control of the House in 2010.
When, not if, the pendulum swings back, the Democrats will be sorry they ended the filibuster.
The Democratic Party is not the same as a decade ago. If you think that only a medical care plan is going to pass then you will be wrong. They will change the entire way the country runs.