True, but cost parity soon cometh. In 2010, the U.S. DoE suggested cost parity would be reached when lithium battery cell packs drop to $125usd/kWh. They set a goal of reaching this by 2022. The 2017 Chev Volt has a battery cell cost of $145/kWh. Nearly there. The industry is now forecasting battery costs to drop to $100/kWh by 2020 and to $80/kWh soon after that. I'd hate to be in the horse and buggy business by then.
In any event, the billions of dollars in health care costs (and premature deaths) arising from air borne pollutants directly attributable to the use of ICE vehicles represent a public subsidy of sorts too. If users were required to bear those externalities, the cost of ICES would exceed the unsubsidized costs of EVs by a comfortable margin.