No doubt, the electric vehicles are more energy efficient than the internal combustion vehicles. The gas fired vehicles exhaust hot air (BTU's) as well as generating heat from braking - both wasted energy from burning fuel. So a much smaller per cent of the consumed energy goes into moving the vehicle with the rest wasted heating up the air. The electric vehicles recharge the batteries when braking instead of generating as much heat and don't have the hot air exhaust. And fossil fuel is a limited supply that does not renew. But, it is obviously easier so far to store mega BTU's in a fuel tank than in an equal volume battery. I suspect the bigger challenge is all the infrastructure needed to generate and deliver the electricity to quickly recharge all those batteries once all vehicles are electric. The article in the original post mentions charging at 500 to 2500 amps to allow for a quick charge. Tesla batteries are currently in the 300 to 400 volt range according to what I read. Who has electrical service at their house that can deliver those amps at those voltages? Nobody that I know, so charging will be slower. Where will those megawatts come from? Solar and wind capacity? I can't see having enough capacity there within the mentioned time frames that the government and auto industry are working toward. Hydro capacity - I don't see that increasing even though it is some of the lowest cost electricity we have. Nuclear? Seems like the best possibility, but recent nuclear projects are so far over budget and schedule that they are being scrapped before completion. Think of all the fuels pumps at all the gas stations where a gas "recharge" takes a couple of minutes. Now think about that quantity of charging stations where it takes hours to recharge. Fairly easy for those who travel relatively short distances and return home each night for an overnight charge. But long distance commuters, traveling on vacation, over the road truckers - some challenges there.
No doubt, the vehicles can be built. I hope "they" have a plan for all the electrical generation and delivery.
IF there were a standard for voltage, connections and size, maybe the battery packs could just be changed out at the "gas station" with a forklift and you could quickly be on you way instead of searching for a charging station for your particular vehicle and then waiting hours for the charge to finish. I sure hope "they" are working on all those plans instead of just the vehicles.