Yes, they could remove the filibuster. But then if the Democrats retake the Senate in the midterm elections they will benefit from the removed filibuster and be able to undo everything the Republicans did in the first place.
The filibuster remaining in place is a good thing because it encourages negotiations and compromise instead of a seesaw battle.
> But then if the Democrats retake the Senate in the midterm elections they will benefit from the removed filibuster and be able to undo everything the Republicans did in the first place.