C6 is different from my old C5
For Europe, GM has chosen the former: Corvette is not marketed there as a Chevrolet product; it is sold as a stand-alone entity in purpose-built dealerships that are labeled as Cadillac and Corvette. But in the US, a brand history based on the everyman, as well as internal GM politics, will probably prevent this.
The removable top as used on the current C6 is the most simple, weight-reducing, and space-saving way of providing an open-air motoring experience. It is also least costly. And when fitted atop the car, it preserves the clean lines of the C6 as a kind of hard-topped coupe.
My C6 is a year old next month, and I have driven it more than 12,000 miles, including in bouts of rain and snow. I have no idea if my experience is typical, but my removable top remains silent and with no leaks.
In Europe, GM hardly sells cars. They have their own plants there to build cars for that market. Our American cars are too big for their dimunitive roads, and there are confiscatory tariffs and quotas in place as well. It makes sense for the Vette to be sold that way, and it isn't just internal politics that keeps it under the Chevrolet banner here. It always has been, it has always used Chevy drivetrains for the most part, and if GM wants to market some kind of supercar, to use your example, why not do so under its own marquee?
Galpin Ford in Los Angeles sells Saleens, including their mid engined impractical ultra car, and, of course, the GT-40. One simply takes on another franchise, though if it has a derivative of the LS-6, and there are GM part numbers all over it, what is the point? Halo cars can sit on the same showroom floor as the Focus.
Toyotas are built to the exact same "quality" standard as their Lexus offspring, the latter simply has more features, comfort items, and higher priced materials in their cabins. Common platform engineering is something GM gets castigated for, but I think mainly because the products are uninspiring. Lexus is simply a brand, and its successful because not only is it typically well-executed, it is also clear in its vision.
What is the "vision" of a mid engined "Corvette?"
My car has seen 25,000 miles of use this past year, and when it rains, it has water leaks over the driver's side window, plus wind leaks at speeds over 75mph. Not too dissimilar from my late '01 Camaro SS.
We should quit worrying about a car which is highly unlikely to be built, and if it is is going to be in such small boutique numbers and at such a high price it will be largely irrelevant how well it works on the track. GM needs to spend its capital on making their cars not only true to their conceptual underpinnings but also as good as they can be within the constraints of MSRP.