I'm sure there will be kits to swap the ice engine to eletricfor most popular cars eventually. Then you will have more control about what features is added.
Fuel tanks are not "in the back" for good (see: ford pinto) reasons.
A big battery in the place of the motor will turn you into a BBQ in case of collision because fire will fall directly towards the driver. Lithium batteries start burning when hit with some force, and can't be stopped once they start burning.