Lets say, you have 47 years left to live.

Does that make those 47 years irrelevant - just because they will end?

There's no contradiction there. It just makes these last-remaining fossil fuels even more valuable.

Moreover oil use hasn't ramped down, nor is it getting replaced in any substantial way. I suspect people have no slightest clue just how reliant the modern world is on fossil fuels outside of it's use in cars.