I would give serious consideration to hiring Werth as a 1st base coach next year. He can count to 3 and can read a stopwatch, and that's 90% of that job. Having him around the clubhouse would probably settle some of the guys down.
I don't think there's any chance the Nats fire Davey this season. There's no upside to it. Whether he makes it back to West Palm in February is another story. My bet is that they give him a second chance and blame this season on injuries.