Am I gonna regret my decision of dropping Willie Parker to the W and now picking up Cadillac Williams?

Parker has been unproductive all year (granted he had injuries) but I got mad and dropped him to the W and picked up Larell Betts or the Redskins but he's actually worse (even if Portis had not played he's still not productive enough) So was Picking up Williams a good move with all his histories of injuries?