I don't necessarily disagree with you but for me, a tank in the market for vintage/pre-war cards would mean I could keep up with my collecting goals and not break the bank...ie. a buyers market (which I wouldn't be too unhappy about). Those who make more of a living off the cards would be impacted, but it's also part of the risk you take.
That said, even if the shiny crap tanks, I think the pre-war will continue strong; maybe not as strong as it is today, but that strength sure hits the pocketbook harder than I'd like. I'd love to get my hands on a low grade Cobb Red Portrait for a reasonable price
Bill