The truth is that gasoline is still king because it is the fastest way to recharge your car. Manufacturing process and incremental improvements have made combustion engine far more efficient and cleaner. It's likely that this trend will not weaken, instead get even more boost more than ever because it offers a cheap alternative to electric cars.
Coupled with a low oil price, we aren't going to see combustion cars disappear like HN folks would have you believe, instead we will see consumers voting with their money.
At some point we will see combustion engine that approach somewhere a bit shorter than the 80~85% theoretical limit of combustion engine efficiency, but that is still an insane improvement to what we already have.
I don't disagree that electric cars will get more popular, but a cheap oil price and highly efficient combustion engine that is coming is not going to lead to an apocalyptic future where sportscar owners are banished to remote islands, free to cause all the pollution they want.
"but we have over 60% efficiency from our combustion engine!" they yell to no avail. The silence of electric cars whirring in the cities snuffs out Doug Demuro's fans.