It is indeed possible to have a city full of low-rise buildings that is still compact enough for excellent transit service—but only if most side streets are used for mid-rise buildings instead of houses.
The National Park Service (NPS) recently commissioned a study to assess the integrity and condition of the Savannah National Historic Landmark District. That report recommends the district be categorized as “threatened.”
Jacksonville's transportation authority has proposed a flashy public transportation service designed around autonomous busses. The proposal does little to improve the public transit system of a growing, Sunbelt city.