There are so many great, safe jurisdictions in the world to bank, to invest, to own property, and to store assets. And you can set all of this up without leaving town.
Canceling passports and closing airports is even easier.
You needn't think, when the crisis arrives, that they are just going to let an income-producing, wealth-holding asset like you just walk right out the door, do you?
No matter how horrid the circumstances, God never backs down on His promises which relate to heavenly wealth.