The transformation of Car from a marvel of Mechanical Engineering to something that belongs to Electrical/Electronic Engineering will happen sooner than later I believe.
May be after 20/30 years the IC engine will completely disappear. I think, smaller less powerful slower cars will be produced in the future.
Electricity is one of the most efficient and the most green form of energy on earth. Yes, today even electricity is produced by mineral oil/gas but it will change.
The world has to find some other sources of energy other than the minerals. That is why I believe 3rd world countries should now plan to rely more on hydro/wind power than on mineral oil/gas because, one day they will run out.
Imagine in the future our cars will only have battery packs, electronic computers, motors and sensors in place of engines and fuel tanks.