A change in the rules by a bare majority aimed at benefiting Democrats today could just as easily be used to benefit Republicans tomorrow. Do Democrats really want to create a situation where, two or four or six years from now, they are suddenly powerless to prevent Republicans from overturning legislation they themselves worked so hard to enact?
Here's the thing: the proposed reforms don't leave the minority party in the Senate "powerless."
Instead, they make the minority party actually work to obstruct the passage of legislation: If you want to filibuster, you actually have to take the floor of the Senate and filibuster. Right now, all Mitch McConnell has to do, essentially, is utter the word "filibuster" and the obstruction is passed. That's simply too low a bar -- one that presumes the minority has veto power over legislation unless proved otherwise.
Old-time filibustering actually worked once upon a time. It's why civil rights legislation was delayed. Filibuster reform is not filibuster removal. If you want to mount a filibuster, Sen. McConnell, be my guest. Stand up, make a speech, and drag out the cots for your colleagues.