I'll take that on a Gentlemen's bet.... :wink
Done. :biggrin I'll also define "huge" as significantly higher than MSRP adjusted for the pace of inflation.
I know it's certainly more desirable due to circumstance and the lack of a successor, but consider a Murcielago. That car just reached 4000 units over it's run and there are Murcielagos that are significantly cheaper than Ford GT's. 4000 is a pretty big number in the context of "rare".
We have definitely lost a big number to wrecks, and there are people like me that drive their car a ton and will never sell it, but it still has to be in the 3000 range. This is why ultimately, as Waxer pointed out, I don't think color will matter nearly as much in the future as mileage and condition.
30 years from now, if you have a Ford GT on MSO with almost no miles, you will have a big pile of money on your hands regardless of the color. You will have also wasted 30 years worth of driving memories (unless of course you have several, as many here do).