This is all moot. Battery technology and charging infrastructure for EVs will improve so much over the next 5 to 10 years that engines running on dinosaur juice will no longer be worth the hassle for mainstream vehicles.
There are good reasons why EVs haven't dominated yet--cost, range, flexibility, etc. Battery technology hasn't changed all that much either: http://www.cnet.com/news/why-batteries-arent-getting-better/
Someday EVs may dominate, but it's doubtful that will happen in the next 5-10 years unless there is a large technological leap.