So far, I don't see any really outstanding players owned by Saudi Arabia, and you are right they should look for potential young seeds who can compete and become stars. Ali Albulayhi, he is indeed known to many people, but we know that he is known as an arrogant player or one who provokes opponents in his own way. We can see some clips when he faced famous players. It is not impossible that they can have players who can make their name more famous, because after all a player who is famous for his abilities will make the name of his country more famous. Like one of the players in the Saudi Pro League for example, Ronaldo.
New era of Saudi League started when they have Ronaldo now they are trying to have few more stars which are good but if they go ahead with their strong domestic system and bring better academies instead of having big names this could be going good for them in future because they already have things which were important for them next few years are going to be important with now FIFA World Cup rights are settled so they needed to work on competitiveness of league in long run even improving quality level through their lower level work which bring more local player in streamline.
They are having enough sources which can keep them on good level but now management and strategy is more important if they are able to have things on good level than surely in next decade we will be having Saudi League on another level which will surely going to compete with European Leagues.