It is a terrible decision for the team. If Cousins goes out there and manages to avoid sacks and gets a couple of wins DC will have yet another QB controversy which will pretty much guarantee RGIII will never be successful there.
RGIII and Cousins could both join the list of players whose careers were killed in Washington. Shanahan is escalating things because he wants to be considered for the Texans job given Kyle's history there. He is just as big of an ass as Snyder.