I think this is like so many things in life, it depends. IMHO, the market for the '50's cars is dying with the exception of some flagships like the 300C/D and "Christine". The early '60's cars are on death's door, even the Max Wedges are losing their allure. The late 60's have a better chance but even these are going to survive as resto-mods. '70's? After about '75 there never was much interest, face it the Warlock and the Lil' Red Express are the most exciting things to come from that era.

What is going to survive, any winged car because it's strange. And any 2nd generation Charger along with some of the late '60's/early '70's B-bodies but I predict that there will be a demand for rolling chassis but not restorations. That resto-mod thing again that the youngsters want. Just my opinion.