Yeah well if we'll ever get a WW3 than the value of the games is (about) the least I care about....
Don't see that happening though....as long as we can keep the germs of the world at least a bit in control....
I think along the lines that Love mentions. You see that younger people are still interested in these games (see events like Eurocade/RGE 2013) on one side, and people who get older usually get out of the costs of kids and have higher incomes and thus more money to spend.
On the other hand, the games are getting more rare, not saying they are still being butchered (which I'm sure still does happen without us knowing) but the one's that are still around will get into collectors hands more and more and less and less "warehouses" etc. will happen.