They are importing fuel now, and may continue. In the future the fuel they import will be cheaper if synthetic. Or they may rely more on transmission lines, and stockpile synthetic fuel for backup in case of outages.

People everywhere will do what works best for them where they are. As synthetic fuel cost drops below extracted and refined hydrocarbons, people will simply stop buying the latter. Forward-looking sunny tropical countries will do well exporting synthetic fuel to places where the wind or sun flags.