With many people not getting EVs any more, the demand will be there - so price will only go up. Even if it does down, govt will add tax to keep it going up.

Based upon the outlook for the UK - the global picture may differ.

Demand for fuel (petrol and diesel) fall gradually over 20 years - new ICE sales will continue until 2035, and those sold towards the end may be running a decade or more after that.

The main impact will be to limit new investment in wells and refining so that capacity broadly follows demand, and modify if possible remaining refineries to change the fractions produced.

More critical than future fuel prices is what happens to oil producing nations. Those which make an implement plans for a sustainable future with reduced oil incomes will be fine. But global stability will be threatened by oil states which don't adapt.