Not that this will sway anyone... but of all pitcher on the Nats that qualify for the ERA title (0.1 IP/Team Game), Lannan has the highest WHIP on the team at 1.41.
Or, nearly 1 1/2 runners per inning. A low ERA, in my mind (mindfact), is unsustainable when you place so many runners on base per inning.
But you're saying it would be smart to "non-tender" him and call somebody up in the HOPES that they can replace him. At least admit that's a big risk - especially if they do the classless thing and non-tender him.
There most certainly is a risk there, I have no problem admitting that.