The Camaro and the Mustang appeal to a different demographic. They could come out with a 4 cyl turbo front wheel drive hybrid with 750 hp for 10 grand that ran 9's out of the box and some of us still wouldn't buy it.
I'm not a marketing major but I still think there is a market for V8 RWD American made cars. I've bought 5 new Mustang V8's since 2002. If they go front wheel drive or 6 cyl or IRS count me out.