Only for some types of fossil fuels. Saudi light crude costs very little to extract -- a few dollars a barrel -- whereas shale oil has an extraction cost of aro

Only for some types of fossil fuels. Saudi light crude costs very little to extract -- a few dollars a barrel -- whereas shale oil has an extraction cost of around $70-$90. You're right in that the Saudis will likely never stop extracting. But there are much larger deposits in the Americas that we quite likely will never develop if solar brings down the price of energy.