I think unrestored cars are the holy grail.
I own several unrestored and original paint (or nearly so) cars: 1937 Ford, 1978 MGB, 1988 Alfa Graduate. and an 1961 MGA with 19K miles. Of these, all but the MGA are cosmetically very nice inside and out. The MGA has some rust and the paint is through to the primer in many spots. While it's an excellent restoration candidate, I think over time it's far better left in the original condition. For the past few years, we've used it as a 3D "originality guide" for customer MGA restorations at Eclectic Motorworks and NAMGAR has asked to use photos from it for concours judging. There are fewer and fewer of these untouched cars out there and I think we'll see people value them in less-than-perfect condition as the hobby matures.
Even if I'm picking a car for a restoration, I always prefer an untouched car to one that's been worked on before. I'd rather have a rusty unrestored car with a lot of worn mechanicals than a previously restored car (often with iffy work done that will need to be undone) that's in better shape.
Regarding value, I'm betting the day will come when unrestored originals even with heavy patina will be worth much more than excellent restorations. That's certainly the case with other types of collectibles.
--Carl