Option 1: Do Nothing.
A perfectly viable option. The Nationals could do nothing at all and simply look to Opening Day. Sure, Tanner Roark is in the bullpen now, but no one ever said having an extremely quality bullpen arm was a bad thing. Also, fingers crossed, but injuries do happen, and the Nats have the perfect sixth pitcher to step in should an injury occur. The Nats should be happy with the arrangement as is. On the to the next option!