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In case anyone's looking for context on this, daily demand for oil is currently around 99-million-barrels a day, so this would be a 2% dropKeep in mind too though that direct percentages can have non-linear effects. Oil is very fungible, but the inputs have a wide range of extraction costs and levels of pollution/technical risk/geopolitics involved. A 2 million barrel a day reduction isn't going to shave off every input source equally, and oil from sands or ultra deep sea or whatever all have different kinds of effects. If it kills the worst first that could have a bigger benefit then a straight 2% would suggest.
Furthermore, there is a lot of oil infrastructure that is fantastically capitally expensive, most particularly refineries, that will not be equally effected. I think maximum plant capacity tends to be around 800k-900k barrels a day and many are smaller, and running subcapicity isn't ideal. Not all types of oil or products refineries produce are equal either, increasing electric cars would presumably primarily affect refined products, consider for example this piece[0] on refining capacity, and then consider what a significant bigger reduction could mean.
Finally at some point we should start to see more tipping points for economies of scale, the spread of enhanced charging networks, continuing spread of solar, and just changing public consciousness and people become more familiar with it. Public interest is racing way, way ahead of what the energy industry wants. So even 2% worldwide in that short a time would be a real deal and could also just be the shallow end of an S-curve. Next 5 years will be very interesting!
0: https://www.bloomberg.com/news/articles/2018-03-06/an-oil-re...