All of your proposed use cases depend on the authorities approving your actions. Governments can and will at some point request standard AML procedures when you are depositing large sums of crypto currency into an exchange. If a state decides to introduce capital controls it would also be pretty easy to shutdown access to such an exchange. You can be forced to hand over your private keys or your public addresses could be simply black listed, making them unusable. I would think of bitcoin more like an insurance (like gold) which you need to buy in calm times. Once shit hits the fan it's most likely too late to buy or send bitcoin.