I think Dodge will be content competing against the Mustang and the Camaro, if it can sell 30,000+ Challengers per year.

The Challenger has a short life cycle due to impending 2020 overall Corporate Average Fleet Economy (CAFE) requirements of 35 mpg, that start phasing-in in 2012 (per the Energy Bill of 2007).

Motor Trend summed it up, in their April 2008 issue:

"We are witnessing the end of an era. Even as the new Challenger and Camaro prepare for launch they'll take flight as the last of the dodos. These large heavy, big-cube, high-horsepower musclecars as we know and lust after them are unlikely to be replaced by similar vehicles."

That is why I am buying a 2009 SRT while I can. (Also, to replace my 1971 'Cuda that I had to sell).