I believe they are shutting down as not only golf, but the Saudi football league are cutting back on spending. This was seen as sports washing by spending vasts amounts of money they could improve the name of Saudi around the world especially wen they are known to have a bad reputation for human rights. They had offered certain footballers big money to lure them to their leagues and if rumors are correct those deals have now been removed. The recent events with bombings in the kingdoms has changed their perspective on what is important and having a decent air force and army is their priority now.