One day Saudi Arabia league could be one of the best in the world and people want to go because of football, but right now people only go because of money.
There was a time China spent a lot of money in football to get more popularity or even improve their quality, they signed
Oscar, Paulinho, Axel Witsel, Mousa Dembele etc, although they're not as popular as Ronaldo, but it did shock football fans.
Unfortunately, their mission are failed, no one watch Chinese Super League.
Although money rule the world, it's hard to see Saudi Professional League will reach top 5 leagues in the world.
The most important requirement in order to be called top league is, the eligibility to participate in Conference League, Europa League or Champions League. Saudi Professional League aren't eligible.