The Saudi Arabian League wants to be enjoy the same limelight that European leagues are enjoying from all over the world and would definitely do anything within their reach to achieve that aim
But I can't imagine that that will ever happen unless the Saudi Arabian clubs or the owners are really pulling the trigger and keep up that investment for a decade and even raise it further. It is not enough to have good players for three or four years and only the older ones. Then they would have to keep spending those levels for a long time and sign players of all age groups to also cover all interest groups that could follow the league on TV and the Internet. Not everyone likes to watch players who are about to retire anyway. But signing younger players will be even more costly in the long run.
It's not like that, because signing younger players automatically these young players are not yet famous players. But, when they recruit players who are old or at least +29 then of course, these players are already well-known in Europe. Therefore, if they signed younger players, it would be the same as signing players who weren't well-known, and thus not making much of a profit for their event. So yes, the tradition of recruiting well-known players who are of course old will continue, and they will not take the risk of signing high-paid young players, especially when they are not well known.
No, the potential risk that is in the air here for the European leagues is that the clubs from the Saudi Professional League start signing players like Mbappe before they reach the age of 20. This is a serious risk because they don't even have to do the scouting and as soon as a young talent rocks a u19 World Cup or even a first team World Cup, the Saudi clubs can see and listen what other clubs do an what is said in the media. And then clubs like PSG offer him 100 million but the Saudi clubs offer him 300 million and someone like Mbappe ends up playing in the SPL. It would even be understandable if a young guy at that age signs a 300 million contract in Saudi Arabia as there is still a high risk of losing potential income due to injury or other circumstances.