There will always be a sustainable market for valuable collectibles. Even within the sports card trading community generations go through phases as they mature into collecting.
Kids still collect, Panini, Donruss, UD, Topps are fighting over licensing rights. They havent gone bankrupt yet.
Today's craze for modern basketball inserts will gravitate to those collectors going after vintage. It only gets deeper from there and they all eventually end up on Net54 by the time they are in their 40's and older owning the RARE stuff...
I've lived through the stages of this thing called collecting in the last 20 years. I also started with 80's baseball and basketball cards when I was a kid. Now i'm hooked on T206 portraits.
As long as there are good paying jobs and sustainable economics our vintage stuff will stay desirable.
It's a gateway to Net54 i'm telling you..