If the trip is much shorter in the air, it may bring the energy consumption closer to ground travel, but even then if we're talking electric energy, renewables are set to make that so cheap it doesn't matter compared to other factors like convenience (it's already that cheap, and dropping every year.)
Commercial air travel is far safer than most forms of ground transport , so it's at least possible that personal air transport could one day be safer than driving.
The big thing really is the advancements in materials science and energy storage density. I don't think we're there yet. But in the next 50 years, very likely in my opinion.
The one thing that may not be fixable is the noise. But this is primarily important for rural living. Air taxis could pick you up and drop you at the subway station outside the city, where the nose won't be that big of a concern.