I don't usually talk about the 'possibility of some kind of economic collapse' as you put it. There's a real normalcy bias concerning the dollars we use, so most people reject simple facts. I feel I should explain a bit to you why the debt based system WILL collapse someday, as it will by design!
Post above I told you it was debt based. Simply put, the money is a note, a bill, debt. Once dollars are printed they are loaned with interest owed. That interest compounds exponentially over time. Soon the interest becomes so high that the only way to service it without bankruptcy is to print even more - that's the inflation. It happens all the time, inflation, and it happens exponentially. In reality, that debt will never be paid in full because the actual amount loaned out is only enough to pay the principle, not added interest!
When it does get into hyper-inflation people are going to look to buy things that will at the very least hold value. There are options, but in my opinion gold is the best. It is time tested and easily recognizable, among many other things. Some people will say it's cumbersome, who's gonna buy a loaf of bread with gold, etc. We have computers now. Gold could be stored in a vault and you would use a debit card to transact - bankers and gvt. wet dream anyway.