The problem with the filibuster as it currently stands, is that it only applies exactly when Republicans want it to apply: The things important to Republicans are taxes and confirming conservative judges: No filibuster applies to either. Democrats want to pass laws to improve things for our country: Unless they fit into budget reconciliation, Republicans can filibuster them.
So heads, Republicans win. Tails, Democrats lose. Manchin claims to be concerned that if we get rid of the filibuster altogether, Republicans will always get their way if they regain power in both Houses and the Presidency. But they do already! I think he and Senema won't have to worry about that, because if congress does not pass the voting rights bill, they will not be reelected. And perhaps American democracy is finished.