ORIGINAL: awsure
It could happen easily. All you so is develop a trim package for the Challenger called the "Cuda". There is no way they resurrect the Plymouth line but heck...one car on the same platform with some stylized differences is not that hard. I guarantee they would sell 'em. That's the determining factor.
The problem with doing this is that it would cut into the Challenger's production numbers. I can't see this happening. Also by doing this they are limiting their success potential by not offering them both. It simply does not make sense to make the Cuda a premium package level offering since again the Cuda was supposed to be the more cost effective option between the two cars.
The reason why I suggested this is Chrysler needs Plymouth back to save the remains of Chrysler's luxury image and to help offer a discount king when cars are getting more complex and expensive.