Manchin is hinting that he is open to reforming the Filibuster. The ideas getting floated to him right now are:

1. Reduce cloture from 60 to 55.
2. Require senator to hold the floor to filibuster, not just invoke it.
3. Remove cloture entirely and require a 40 Senator affirmative vote to continue debate.

1 doesn't really do much for Dems, but 2 and 3 set a hard time limit for the minority to delay which means the Senate becomes in practice more majoritarian.