You make a good case, but I think that's your love for the car talking. I understand just how you feel. Only time will tell... but I really do agree with others that the chances are extremely slim.
The car hasn't been produced in 8 years, so part expense will always increase unless they're common to other cars. (I.E. Engine Parts, etc) As far as $300 body panels are concerned, I'd like to see the quality of THOSE body panels... hehe.
Body shops will typically use after market body panels unless the car is newer for the very reason you've mentioned; cost. After market panels MOSTLY match up, but there is always a deviation from the original part. A good body shop will make it so you don't notice, but they also charge you more (because they're good at what they do, hehe). You can always request the OEM part, but if it is an older car you either gotta pay or convince the insurance company to cover it in one of many ways. I have had some success with that.
If it is a specialty manufacture item... well, it BETTER be expensive, otherwise it isn't very good.
Still, I know just how you feel. I love this car.
I probably won't be selling it either. I am rooting for it to become such an item... Like I said, though, I think the chances are slim. It doesn't hurt to hop against all odds, though...
Now... there is a chance that gasoline cars could be banned in the reasonably distant future (far enough for collectors items to come into play).... hehehehehe That would suck for our odds..