The thing is that the supply of fossil fuel depends one's willingness to spend effort finding it. There's a virtually unlimited amount of methane on the ocean floor but harvesting it is not economically viable (fortunately).

US fracking technology allows otherwise unavailable heavy oil to be harvested but naturally at a higher price than Saudi light crude.

So solar tech, as it declines in cost, will replace a larger and larger portion of fossil fuels but not the entire spectrum of these some come out of the ground close to the form we need them in (solar asphalt is hard to imagine with subsidies).

> solar asphalt is hard to imagine with subsidies

Arguably asphalt is exactly the sort of application we should be using petroleum for - keeping it sequestered in earth instead of burning it.