The question I have for you is, what are you invested in now and just what do you think an economic collapse is?
A) I don't know what media you're watching/reading/listening to, but the US economy is NOT in danger of collapsing.
B) Toys are a bad investment. If you want to invest, buy stocks and/or mutual funds, not toys.
C) Even if the economy collapsed and there was no market for used toys, my collection wouldn't be "worthless" to me because I would still enjoy it as much as ever. It would only be worthless if the only value you see in it is the monetary value. And if all you're interested in is monetary value, see point (B) above.