Electric car technology isn't new. I read somewhere that back before the infrastructure of gas stations were put into place that the most common vehicle technology was electric, 100 years or more ago.
The next step, IMHO, is offering electric motors as an alternative to gasoline or diesel engines. For example, a pickup truck like a Ford F-250 would offer a 4.6 V8, a 5.4 V8, their V10, and some electric motor with equivalent torque/horsepower as engine choices.
Same with cars. Eventually, the main source of power will be electric motors across the board, and gasoline engines as direct drive (as opposed to generators) will be phased out.