Forcing them over is silly. Any repairs that come in , sure, then "force" them over. But to spend money converting them, and resulting in lost customers is a bad move. Its not hurting anyone to leave them where they are. Their copper line may not need repair for another 20 years, and its costing AT&T nothing to leave it AS IS.
This is the first time I'm going to agree with you on anything. you're right.