Doesn't take a huge decrease in production to result in a huge increase in price, due to inelasticity in demand.

Renewables and EVs are a capital-intensive industry, and the thing about capital-intensive industries is that they're prone to bubbles. If you get a year or so of EVs being cheaper than gas cars, you will see a huge growth in sales as lots of consumers make the rational choice all at once. The spike in sales will spur a bubble in capital investment as investors all rush to capitalize on it. The capital investment spurs R&D, which results in technological improvements which make the cost advantage permanent.

At the end of the 5 years (or perhaps even before) the price of oil will crash back down, probably lower than it is now, as increased EV adoption destroys demand more than supply was choked off. But at that point we'll all own EVs, they will cost less than gas cars, there will be chargers everywhere, there will be solar panels everywhere, and we'll have better batteries and V2H charging.