I agree w/ Tupperware. It is way too hard to predict 30+ years out and I frankly believe (you can shoot me) that there will be too many of this cars, identically equipped to make much of a market. The stuff Barrett Jackson does for top dollar are truly very limited production number cars and usually oddity of some sort (because you could order it uniquely) and it somehow survived. All those elements add up to collectabilty.
That said, I suspect Silver ones will be more unique (less of them), but who knows how that will convert to "desirability" as Yankee said. Ford has some modern day examples now with the 2001 Bullitt mustangs of which the Blue was least produced as well as the Red Marauder in '04. Well have to see. Hell, who knows if they'll even have "fuel pills" 30 years from now to run these puppies