I don't think they will suffer too much from foreign exchange. Tourists and other foreign visitors would still spend dollars using their credit cards. There would still be a need for dollars. And, dollars still serve as the basis for pricing goods and services, even if paid in BTC. Dollars, also serve as the peg for several stablecoins.
Once the floodgates of BTC are open, it would not be a big stretch for citizens to dabble in altcoins as well. While they may not be officially considered legal tender, LTC and such are easily converted to BTC. Altcoins would be a useful bridge for trade with others who do not use the Lightning network.
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Great point of view on this subject, @travelwrtieoney. There are so many options ahead.
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