Two quick points:
First, as most of you already know, the Corvette Z06 is NOT a GT competitor. I will actually give it an advantage in terms of pure motor, as I love the normally aspirated feel (and sound) of that 7.0-liter V8. It's also got more toys (dual-zone climate control, cruise control, stability control, etc.) than the GT, though, unlike the engine, those items mean almost nothing to me in a supercar (I'm sure they mean something to some buyers of these types of cars, just not me).
After that, it's all GT. Looks-design-material quality-heritage-rarity-and, yes, even performance. While on a spreadsheet the performance numbers look close, drive them back-to-back and you'll learn first hand what most automotive experts know quite well -- numbers are numbers, and they simply can't tell whole the story. The GT is barely beating the Z06 in instrumented testing, but it's destroying it from behind the wheel.
I will never begrudge anyone for buying a Z06, because the performance you get for the dollar is astounding. That said, I have NO interest in owning one. The design and build quality are typical GM (meaning little inspiration on the former and a near total lack of execution on the latter). And please don't get me started about the shifter... Some people yell about the GT's lack of cargo space or the bizarre doors that require careful entry/egress moves. Well, I use the cargo area only when I'm carrying more than my personal items, and even the doors are only used when I get into or out of the car. But I use the shifter every 3 to 30 seconds, on average, and to have that wrong in a supercar is simply unacceptable. It's like saying "Yeah, I love that airplane. I just wish it could fly."
Second, regarding the dim prospects for a GT follow-up, I agree that Ford probably can't afford it, and they've lost so much of their core brain trust on the product side there's hardly anyone left to see a GT-like follow-up through. But I can vouch for both the capabilities and the passion of Hau Tai-Tang. Remember, this guy was behind the 2005 Mustang redesign, which I think is easily the best Mustang since 1970. Now he runs SVT, so you can bet the GT500 is going to fully exploit "his" car's capabilities. Between what I absolutely know and what I think I know, I'm confident the GT500 will be the cat's meow and then some. I know it's not exactly a GR-1, but if it's got the level of performance, design and interior quality (plus a shifter that works, unlike certain "supercars") I think it will do to the Corvette Z06 -- in reality -- what many people THINK the Z06 does to the Ford GT -- offer almost the same level of performance for far less money. But unlike the Z06, it will look and feel good, inside and out, while doing it.
Okay, so I guess the two points weren't that "quick."