Earlier quoted context omitted.
Why would us HN readers (or perhaps you just meant is Americans?) need to have a plan for what happens to KSA if oil exports drop? They have their own plan for that, which is why they’ve invested so much into diversifying their economy.
Because we live on Earth. Saudi Arabia is a strategic ally in the Middle East. We need to have a plan for the future when the geopolitical landscape shifts and incentives change. Nobody exists in a vacuum, our interests are intertwined with everyone else's.
It’s really a rather imperialistic perspective tbh. To presume all of these countries need us to be making decisions for them, or that we would have any right to do so in the first place.