The Nationals will look for another pitcher during the offseason but I think they'd prefer to hold onto Moore in case LaRoche leaves. And there is always the possibility of a deal involving Michael Morse during his final year of contract. Tyler would be needed for the club if any of those two things happened.
I believe Rizzo would listen to the offer, but a lot would have to happen for it to go down. Particularly because at worst Moore is a good platoon player off the bench in case of injury in 2013 and they can always spend money on a pitcher without losing a player.