Those "Pony cars" like the Camaro, Mustang and Challenger may be used someday in Busch, but I don't ever see them being used in Cup. They went bigger for safety in the COT, so it would make little sense to go smaller in overall body size. The Avenger, the Impala, the Fusion and Camry will remain unless they replace them w/something similar in size. If Ford keeps making it, I would not be surprised to see them switch to the Ford 500 someday, but it will probably be the Fusion for a long time. Ford is not real big on change.