Yes its an option but FAR from being realized on a scale where we are down to 5 million barrels per day. Let us not forget that the electricity used to recharge these batteries come from plugs that are supplied by coal or nuclear powered electric plants. The environmentalists would have a fit if they saw more coal being burned or more nuke stacks being erected. Its definitely an option WAY down the road but right now its limited. There is no one fix-all for the oil problem in this country. Too many variables to pin your hopes on one idea.