Apart from the Eagles condition, the big assumption above is that the Redskins are done but who knows if they really are. Even if they don't have Nick Foles.
Of course they could also get to 6-6 and easily lose three of the last four games (at Cowboys, at Rams, Texans, at Redskins).
And yes, Groh has failed, but that doesn't mean hiring someone of similiar pedigree (longtime offensive assistant) or an experienced coordinator from outside would have worked out better. That all goes back on the HC though, since the theory was, it's his offense and he just needs people to help run the show, not an OC calling all the shots.