These are not rare cars, in general. Hence it will take a loooong time for any desirability for collectors to manifest.
The rarest will find this quicker, like the Boss 302 LS. However, rarity does not always equal desirability in the collector world.
What we see now watch B/J on TV isn't reality and will likely never occur again. The combination of socio-economic forces driving that collector market is likely obsolete. Simply put, kids don't give a **** about cars today like they did back in the heyday of the musclecar wars. Thus, there isn't going to be a big collector market out there when those same kids turn into fat old geezers with money.
Hell, in 40 years, maybe your gen 1 Ipod's gonna be "the thing".....