All models and predictions will be based on assumptions, for example, there is a movement to not pay bills.

What if the people not paying decide that, since they are not paying, they might as well use as much as possible?

All it would take is a charismatic populist to come along and to promote such a thing for any reserves to be gone.

I am not sure that having LNG ports makes much difference if you have a minor currency such as Sterling and you have to just print more of it to pay for LNG. Other customers might have a manufacturing base or lots of gold, which would trump paper money.