Those are all solutions to problems the Dymaxion car didn't have? The main complaints of the Car Talk article are the awful handling resulting from rear wheel

Those are all solutions to problems the Dymaxion car didn't have? The main complaints of the Car Talk article are the awful handling resulting from rear wheel steering (giving a bad caster angle resulting in no self-centering-- all modern tricycle motor vehicles put the steer tires at the front, even if it complicates the linkages) and the aerodynamic shape that resulted in a large car with surprisingly little usable interior room. (a classic Buckminster problem, as this is still the big downside of geodesic domes) All the big compromises of the Dymaxion car came from the shape, which let it hit a drag coefficient of 0.25. But modern car engineering has simply passed it by: a Prius is 0.24 and a Model S is 0.208. There's no reason to accept the downsides of a Dymaxion car today, which is why nobody ever copied the design.