The only way the ICE can be a mainstay of automotive transport will be if cars become vastly smaller, lighter and more aerodynamic.
Check this news item from last week.
http://www.autos.ca/general-news/oil-consumption-hits-an-all-time-highAt 87 million barrels of oil consumed daily on this planet, our annual oil consumption is 32 billion barrels. "Proven" (how much do the Saudis really have???) oil reserves are 1,500 billion barrels giving a 50 year life to reserves. This assumes no more reserves discovered and consumption will remain flat. Consumption will continue to skyrocket in China and India though and there will be more discoveries although these are fewer and smaller. eg that big find in deep water several hundred km of Brazil's coast was the biggest in 20 years but there is only enough oil in it for 1.3 years global consumption.
Also, as a climate scientist will tell you, in order to keep carbon emissions down to the level to prevent any more than a 2 degree C increase in global temperatures, 3/4 of the current know reserves will have to be left in the ground. Not a great likelihood unfortunately but, any way you cut it, the cars we drive will have to get much smaller and probably much slower.
Suits me fine but there will be huge resistance from some quarters.
Kerr's prediction is probably right for 2020 but things will have to change dramatically after that.
Cheers,
John M.