Very tempting, as consistent RB production is crucial.
In a keeper its harder to give up RG3 as Peyton is older. But RG3 could pull a Newton or Vick.
How many QBs are kept year to year? Guess you would them keep Rice, McCoy, Thomas, Nicks/Manning?
I think if you want to win this year then consider it. I assume if Vick is benched for Foles, they will start using McCoy more.