If the plans of FocusFusion.org pan out (and they're ahead of sched right now), 'scientific break-even' will occur this year, by 2020 much of the grid load will be distributed naturally onto its little 5MW generators, and costs will have plunged by a minimum of 10X. Maybe 20X.
That will truly be a whole new ball game for BEVs.* And everything else.
* A full charge for a current-model Roadster would drop from about $3 to about a quarter. That's the coin, pocket change. 25¢. 0.1¢/mi.