Mitsubishi knows full-well that it may be a possibility, as they themselves have stated recently that lithium demand will outstrip supply as early as 2015. While we all expect and hope that prices will fall as production and popularity of EVs increase, prices could possibly rise instead, forcing us to other automobile alternatives (air-compression technology perhaps – see http://www.mdi.lu/english/). With such a demand on batteries worldwide for all sorts of applications, the implications pose new challenges to make better more efficient batteries using less lithium.
And competing countries are getting the edge over the US, who seek funding to stay ahead of the battery pack –http://earth2tech.com/2008/12/18/us-tech-companies-unite-for-car-batteries-seek-gov-aid/.
Where to get more lithium? Bolivia may come to the rescue – if only they can sort their internal political/economic issues first…
http://www.guardian.co.uk/world/2009/jun/17/bolivia-lithium-reserves-electric-cars