> But, while technically innovative, with a carbon-fiber body, the i3 is essentially a very expensive hatchback.

Yep. When people buy high performance or luxury cars, part of the mystique is that it is the latest evolution of some sort of classic. It's going to be hard for BMW et al to position electric vehicles as belonging to any existing lineage. This puts their brand at risk unless they can figure out how to make a remarkable electric car. But nobody really knows what that would be.