What happens to the Saudis when the Oil runs out?

Saudi Arabia is the biggest producer and exporter of oil in the world. approximately 80 percent of the Saudis GDP depends on its Oil exports. However the country is currently at a moment in it history where it has realized that very soon, the oil is going to run out. Not only are its oil reserves slowly dwindling but the amount of domestic energy demand has also increased which means alot of the oil revenues and indeed the oil itself is going to meet the growing energy demand. An article in the telegraph (famous UK economics magazine) predicts that Saudi Oil may run out as soon as 2030. the big question is, What does this mean for the US economy? The US economy is highly dependent on Oil from Saudi Arabia and that is a fact. approximately 13 percent of its yearly oil imports come from the Arab state and because the US imports two thirds of its oil, this is by no means a small number. And it is not just the US economy, Saudi oil is exported all over the world. What will happen when it runs out? It could be argued that other countries will step up and harvest the oil that is present within their own countries but what will happen initially?Will we see another oil crisis like we saw in 1973? What will the transition be like? what will the political implications be like? Lets not forget that the US has openly been courting Saudi Arabia for many years due to the oil trade and its strategic alliance with the country because of its location in the middle East, If that incentive does not exist anymore, does this mean that the US will overlook Saudi importance. What will happen to the welfare Saudi economy and worse off, what will happen when the greatest oil producing nation in the world goes barren, the implications seem to be very negative, both economically and politically.