You forgot to add how we will generate all that electricity at a reasonable price while living up to our "green" mantra?Batteries in my opinion are a growing problem that has yet to blossom. What is the environmental impact of manufacturing them in huge quantity? How many charge cycle or years of duty before they need to be replaced and disposed of? What does it cost to re-battery an electric vehicle? What is the economic and environmental toll for disposing of these batteries?
Bear in mind, we're not talking about swapping out a couple of D-cells in a flashlight. The Chevy Volt uses a 435 lb Li-ion battery. The Tesla Model S has a 1200 lb Li-ion. The nissan Leaf carries 660 lbs of Li-ion batteries. The Prius carries 118 lbs of Li-ion batteries. Building a prototype or a couple hundred or even several thousand of these isn't the problem. The real problem is what happens when 17 million large battery dependent cars are manufactured every single year. What happens to all these batteries in 6~8 years when they need to be replaced? Can we pile them all in your back yard? This is the problem that's going to hit the fan one day. Then everyone is going to look around and say... why didn't we see the obvious coming?
I'm not even going to touch the topic of where the source energy to keep recharging all those batteries comes from.