The PGA Tour is a monopoly that exists in part because of special tax privileges. Monopoly and tax status are both likely to get challenged in all of this. Competition is what protects workers. Most are focusing on the big names but the lower and mid tier players are likely going to see a big benefit. Golf is very hard to crack into. It is expensive and difficult to get through Q school and most guys don't keep their card once on tour. This might push the PGA Tour toward more guaranteed money which will give more marginal players a financial cushion. The 125th guy on the money list made right a million last year, which after taxes, caddie and travel is okay but certainly not great for how tenuous that position is. That person could be on lesser tours pretty quickly. And the 200th player made $156,000 which is pretty subsistence even with sponsors and pro-am money.
As far as the Saudis, I see this as a moral good. Trade makes it so people who otherwise might hate each other find ways to coexist because it is in their mutual self interest. Countries that are economically interdependent tend not to attack each other. Saudi Arabia is closed off to much of the world. A benefit with sports and entertainment is there might be some (small) influence on the culture.