Let's divide the discussion into two parts (the first relates to Bitcoin as a network and the second as a currency):
Good idea.
I'm pretty sure a national economic crisis highlights fiat's limitations, not Bitcoin.
I mean sure, Bitcoin has limitations -- but what would you like to compare it to?
1. Gold? Sure, try storing gold and see if people don't start robbing you.
2. Fiat? Try see how much your fiat buys you today, tomorrow, and next week.
3. One of those altcoins purporting to support broken economies like Dash? What happens when the devs and companies stop marketing it?
I never agreed economic crises would push Bitcoin to the fore anyway. People need to eat when money's an issue. Not buy Bitcoin.
But Bitcoin certainly provides avenues for transfers, for independence, for storing value securely. It's not pretended to be much more than that.
I've never liked it when people would look at financial crises and then directly relate them to crypto-currency as if they were able to fix them. Crypto-currency has only ever been a secondary payment method and a possible storage tool for capital, but if the market eventually goes to shit, people are going to be looking at getting the essentials, not buying BTC, and we'll likely see a BTC crash since a lot of the users would be cashing out for the essentials, not keeping their money in a speculative currency - although this is a pretty extreme example of a market crash.
If a country has problems with banks, people start switching to cash. So, unless there's some hyperinflation going on, cash is better than Bitcoin, since you don't need electricity and internet connection to use it, and it's already widespread. Bitcoin could be useful for international transactions in those countries, but majority of people don't need them.
It [bitcoin] could help them, perhaps, if they were sitting at home with 24 hours worth of electricity and internet, and they could work online to get paid for their online work.
I've recently
made a thread about how hard it is to find online work that pays in Bitcoin.
This is also pretty true in most advanced currencies, a lot of the people in struggling economies are known to keep a large amount of cash to spend and use in the case.