I think even a significant change in the economy wont necessarily be big for btc.  I mean look at what happened in Greece.  People tried to bring a bunch of btc atms into the country, but it was too little too late.

And you really think in an economic emergency situation people will be thinking "how can I get my hands on some bitcoin?" I doubt it.  People will be raiding grocery stores, etc.  Some may buy some btc, but it wont be enough to jump the price.