Nissan did a great commercial at the launch of the Leaf [1] showing a world where a lot of our electric appliances were powered by gas. It's obviously absurd, but that's part of the point. I think we'll look back on this period 30-50 years from now and wonder in amazement that we drove such obviously inferior polluting dinosaurs for so long.
While I don't own an electric car, any argument that there's no consumer benefit to electric car is just silly on its face. ICE engines need just so much maintenance in comparison.
I think they will start around cities and dense suburbs, partly because of the reduced mileage demands and benefits of regenerative braking in stop start traffic, and partly because of democratic intervention to lower air pollution.
That will concentrate demand and seed the building out of infrastructure, which can then migrate outwards. The more rural you, the longer the switch will take, and some areas may not switch for decades.
1.26*3.8=$4.788/1.30=$3.68 a gallon in the US.
Since the environment is a collective problem rather than an individual problem, the transition wouldn't ever happen without government intervention.
Hence, I think the moment of inflection is entirely down to government policies, and very little down to consumer desires.