number of EVs sold in 2010 - 2011: 17,500
number of EVs sold in 2014: 123,000
Growth rate: 600%
By comparison overall car sales:
Growth rate: 29%
So it would seem that the growth in sales of EVs is far outstripping the growth in sales of automobiles as a whole. EVs are still a small fraction of total car sales, but back in the early 1980s cellphones represented a small fraction of total phone sales. Look at what's happened since. It took a few decades but improvements in battery technology have helped make mobile phones ubiquitous.
The are sooo many industries dependent upon and investing in battery technology that the range and cost of EVs will almost certainly improve dramatically in the next 5 years and continue to improve after that.
Another thing to consider is that regardless of how you may feel about global warming, California has some very aggressive goals for emission reductions by 2050. They likely won't meet them. However, to get even close, substantial electrification of transportation (including personal vehicles) is practically required. California represents a huge market for automobiles. There will be a continued push for improvements in EVs from a number of directions.