Maybe you could purchase their house using cigarettes as currency? 

Not to mention that you are exposed to their local currencies which recently have not done too well when compared to the US dollar.

Additionally, what could happen if the currency continues to be devalued at an ever increasing rate, making it hard for our tenants en-masse to pay their rents since the bulk of their worthless cash would be going to food and energy costs. 

This is the end of the dollar reserve currency. 

Foldvary observed that crashes tended to happen every 18 years in America starting when land first went for sale in 1800, 1818, 1836, 1854, 1869, 1887, 1903, 1924, none in 1942 because of WWII, 1970, 1979 due to Britton Woods currency collapse and then 1990.

but more out of a lack of options than the strength of the currency. 

I firmly believe that collaboration is the new currency.

Certain countries like Costa Rica and Panama use the US dollar as their currency.

Crypto is not a currency, it is a speculative investment, like buying gold or buying baseball cards.

Over time, assets appreciate, and fiat currency declines in purchasing power.