I don't think lithium is that rare. A lot of the greases on the marketplace use lithium based soaps as thickeners and I've never heard anyone saying that lithium prices or a lithium shortage is causing them to shy away from such greases. Then too if it's used in auto batteries it's pretty certain that any metals would be recycled. I'm not familiar with the economics of $10K batteries, but I rather doubt that the cost of lithium itself plays much of a part.
Getting Charged Up About Lithium [View article]