Not altering the filibuster or removing it
That's a pretty weak "both sides" type answer, especially given how much progressive legislation has historically been passed even with the presence of the filibuster.
But what benefecial bills would you say in particular were halted as a result of failing to remove the filibuster?
Demd had 60 votes for the ACA.
If you are talking more recently, there are only 2 vocal dems (maybe a few more silent ones) against eliminating the filibuster. How many Republicans would vote to eliminate the filibuster?