Some guys don't have much good to say about retro-styled cars- as if building a newer version of a classic in some way degrades or devalues the original. Nonsense! The chief advantage of retro-styles is that the company has the opportunity to correct all those niggling details which dogged the originals (ie: wheel wells) and add all the updated technologies of the day.
Imagine a midyear which was lighter, handled better, more dependable, gets better mileage, faster, you name it. Would it sell? Damn straight! I would think the biggest concern would be stealing market share from the C5.
If GM builds a retro-musclecar, I'm willing to bet it wouldn't be a Vette- it would be a Camaro/Firebird or maybe even a Chevelle. Improvements in unibody construction are innumerable and the first bodystyle has a solid collector base and still generates interest.
Ford's biggest venture into retro was a safe bet. There is no Thunderbird to lose marketshare. Ford has a good idea by restricting the quantity. Talk about a way to guarantee your retro-design will become collectible!!