I also don't see the need for 6 cylinder, but only if they offer a 4 cylinder turbo Camaro.
Most people that buy a 6 cylinder Camaro care about MPG and that the car offers 300+HP.(Looks play a major part)
So with a 4 cylinder car with turbo the MPG would be pretty high and performance would be similar or better than what the V6 offers at the moment.
One thing I would hate would be a 7 or 8 speed transmission since it would shift too much.