...Lesson for Nasa! US Airmail and Aviation

You're wrong. As price rises, demand falls due to customers switching to
alternatives. Eventually, you end up with oil that's so expensive, no one
in their right mind would use it, so you never truly "run out" of oil.

As price rises, demand falls; as demand falls, price drops. If hardly
anything runs on oil, oils prices will crash into the dust, and it will
be affordable for other uses. So yes, we will use it all up eventually
- it just won't be that important by the time it's gone.