There is no need for it to happen. This weird idea that getting poorer will ensure the long-term survival of humans is in error.

Don’t you think oil will keep getting more expensive?

That what I had in mind. It seems more and more costly to extract it.

Oil will eventually be very cheap because demand will be a lot less than it is now.

I never heard that projection before. Because demands will plumet?

Then It might just be not cost effective at all to go dig deeper or use more complex process to get it.

How does that works with current recent trends? Globally we consumed more oil in 2023 than 2022 for instance.

If demand plumet somehow … can we still support a extraction industry ? Recently ( pre 2019 ) shale gaz was worth it because of high prices… then it switched again to lower price and extracting it made little sense ( till next time )

Once oil is used only marginally for fuel and heating, the demand will be a lot less (minus 80% or thereabouts) and going after difficult to extract sources might indeed not be economical but also not needed to satisfy demand (unless this happens very very late).

During the transition there could be cost spikes at demand levels that are awkward to fill without expensive resources, though.

Motor véhicule is 50% and aviation 5%, idk about heating.

So we assume that we replace all explosion engine by EV. Correct?

Mostly replace, yes, there is also electricity generation via oil to be replaced.

And we talking about individual cars & trucks. Correct ? Not mass transportation. Can we build that much batteries, lithium wise ?

Everything (with perhaps a few exceptions like aviation that might use fossil fuels longer). Also, don't think it will all be batteries (and then all lithium), as there are other ways to store electricity, too.