Some other manufacturers will contribute of course, but even if 60m electric cars rolled out annually starting now and started replacing ICE cars, that will take (1B/60M) * years, which is 16years and 8months.
The only way this could be sped up would be the rise of self-driving cars, an increase in public transport and the continuation of urbanization. If many manufacturers stopped making ICE cars and we used much less of them we could replace enough of the current fleet for it to be non-trivial in a few decades.
[0]http://www.worldometers.info/cars/ [1]http://www.huffingtonpost.ca/2011/08/23/car-population_n_934...
Also, this is a pretty lofty goal for tesla. They haven't produced working self-driving tech (the ones now work at low speed and highway but are not 100x better than humans), they don't have experience with high volume production, the gigafactory isn't complete yet, etc. I am really excited for this to happen, but I am not sure if when that clock sweeps over into new years 2021 there will half a million autonomous teslas.
Would never bet against Musk though, hope I am wrong.
- No great options currently for charging in apartments. Virtually the entire world is on an urbanisation trend, so this segment of potential EV owners is really important for adoption, and isn't being currently served.
- People replace their cars at much slower rates than smartphones.
I think there is a lot of potential for disruption in the transportation sector. Trucking companies and taxi fleets don't care if their vehicles are big, ugly and heavy (as they would be if outfitted with batteries), cost is the main factor. When EV running costs dip below the cost of ICE vehicles (and when battery density improves the range sufficiently), these guys are going to have a huge incentive to invest in EVs quickly.
Also, if someone figures out how to build an electric jet in the next few decades, it will transform the airline industry who are currently held hostage by the price of oil. Perhaps airlines can compete on service rather than price gouging on "extras" that used to be covered by the cost of a ticket, to make up for razor thin margins. Airports could also be built closer to city centres, as the noise and air pollution concerns disappear.
EDIT: Remember that a parking spot can easily cost over $10,000 so the extra money for a charger isn't that much.
I've lived in many apartments, but I've never lived in an apartment that included access to a garage. Many of the apartments I've lived in only had parking available on the street.
When someone announces a mass-production electrical storage system with 5-10x improvement, we can have electric aircraft as something other than a novelty.
It's a big part of why Apple makes such incredible amounts of money from iPhones, but their iPad revenue has dropped off significant.
"Electric cars are always full every morning" is only true for people owning a garage.
I am really excited that there may be a fleet of self driving electric cars in urban areas in 10 years. It's going to be awesome. But I am willing to bet for the rest of us its going to be a more conservative change that is going to evolve over decades.