I'm not sure how far they can go with the boxy design of the charger and 300c if it's staying on the same platform. I would say they need to find a way to lose weight and shrink down the 300 and charger to get it closer to competing with the midsized cars from toyota and honda. The sebring and avenger have absolutely no shot without a ton of money injected in to them which chrysler doesn't have.
Just because they get rid of the boxyness doesn't mean it has to be less aggressive.