Oddly enough, rail served more rural communities earlier on in the 20th century than they do now. This is due to disinvestment and the prioritization of personal vehicles. So not only is transit realistic, but it was the way for many railroad towns to be connected to each other and the rest of the country. Obviously that’s historical evidence, life is more complex now, but things can still be made to work with transit. Increasing bus frequency and coverage sounds like it would help your community.