Saudi Arabia's league will not be among the top five best in the globe.Because the league is not as competitive as the Premier League and others in the European League, the players they are buying in the European League are already failing, they will not perform well, they will not have the fitness that they had previously, it is difficult that young players would sign for the Saudi league. If you play in any European league, you will know your performance and talent, and they will know you better than if you play in the Saudi Arabia league, when Ronaldo comes to Saudi Arabia league. I believed the league would have more viewers than the Europeans, but they have money to spend to any players they want,because they are among the richest.
The Saudi League has risen in a revolutionary way (in terms of interest in it) in just a year and a half, why shouldn't they continue to develop at a similar pace? They have a lot of money and now more and more young players are moving to them. I see no reason why in 5-10 years they will not be able to build a system similar to the Premier League (at least for the top teams) and not become the top 5 league in the world. In addition, all leagues (except maybe the Premier League) are now in a not the best position in terms of finances and further pressure from the Saudis will worsen this situation.