Cost of batteries is dropping and because of that the cost of electric vehicles will follow, attracting more customers which will render the market interesting to more manufacturers which again will bring costs down (rinse, repeat). It's just a matter of time; if I had enough resources I would have invested in electric cars long before Tesla was born; predicting their success is no different from saying in 2000 that one day all light bulbs will be replaced by LEDs and all film cameras by digital ones. Tesla is investing now to create their future success for being the first or among the first in that market.
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