Might be worth quoting sheik Yamani here; "The Stone Age did not end for lack of stone, and the Oil Age will end long before the world runs out of oil."The stone age ended because something better was developed, and there will come a point where it is worth developing alternative fuels. The oil companies are looking at this (not much of a business plan to rely on a finite resource for your future income, only politicians are that short sighted) but the cost of any usable alternative are such that it cannot reach the market until petrol becomes a very great deal more expensive (if you developed a fuel that was indistingushable from petrol today it would never be licenced for public use - petrol explodes, as noted above). Some years ago I was told the research costs were an acceptable gamble if oil was at a constant $100/barrel. That is probably doubled by now by infaltion and tighter regulation.

I suspect anyone reading this can be confident of a supply of petrol for the rest of their lives. Once petrol has been replaced as fuel for distribution and mainstream transport (cars), the small demand from motorcyclists and classic vehicle fans should result in a price reduction (but still higher than today). We will of course still be in the same position we would be with EVs; you'll get petrol for hobbiests in the developed world, but the less developed areas will only have the new fuel for basic transport. By the time that happens though, which countries will be developed and which not is anybodies guess.