I am a Redskins fan and am not sure they can beat Seattle. Its possible, sure but it isn't likely. Seattle has a great defense and running back. The redskins defense is surviving purely on hope right now by the looks of it.
However, I could just call their entire Read Option system they run in Seattle a gimmick and say they'll be beaten soon enough like some other fans.
Time will tell. For now, enjoy the win and see what happens.