content: I'd argue they are taking off, but they still have a very long way to go before reaching a critical mass.  That being said, more electric cars means higher demand for charging stations/infrastructure which in turn will make purchasing an electric car more appealing.  Countries like India and China giving incentives to go electric will make a huge difference.  I don't think Tesla will be the ones to do it though, way too much stock is put into them.  I think it will be a larger automaker with a cheaper vehicle.    https://upload.wikimedia.org/wikipedia/commons/thumb/f/f7/Global_plug-in_car_sales_since_2011.png/1024px-Global_plug-in_car_sales_since_2011.png