Now, that means you have successfully demonstrated how Bitcoin cannot be confiscated. That's a good way of illustrating how Bitcoin is indeed about complete ownership. You own your Bitcoin. In that way, your worth is kept safe and untouched despite a situation when the economy and society collapsed. The next steps that you will do are the ones detailed above my post.
But I will ask you, what exactly do you mean by societal collapse? Because if it is a situation when the entire society is reduced to rubles and people are going back to the primitive ways, then I'm afraid Bitcoin is also rendered worthless.