tl;dr It's happening! Gas guzzlers will soon cost more to purchase than battery electrics worldwide, and the death spiral will pick up ever more speed. (They already cost more to own.) Plans for hundreds of EV models have been announced. Cars, scooters, motorcycles, pickups, panel trucks, buses, 18-wheelers, locomotives…
We can't do them all today. This is primarily about cars. There will be enough Fridays for the others.
Plummeting battery prices to make electric cars cheaper than gas cars in 3 years
EVs are already superior to gasoline cars in many key respects: they have faster acceleration, much lower maintenance costs, zero tail-pipe emissions, and a much lower per-mile fueling cost than petrol cars , even when running on carbon-free fuel.
Electric cars may already be making gas cars as obsolete as ‘flip phones’, experts say
Bullard explains in a Bloomberg article that this crossover will start in 2022 for large vehicles in Europe, but quickly spread to smaller vehicles and other parts of the world as battery prices continue to plummet.
Based on BNEF's previous predictions, all of which were too conservative, I say 2021. (I am not the only one saying that BNEF is behind the curve.) But let's look at real products and real numbers and real development.