Saudi Arabia league will soon be as competitive as Bundesliga or Ligue 1 if they continue recruiting players that way. They started with Cristiano Ronaldo and every day you hear about new name coming to play there. Mendy, De Gea, Neves, Koulibaly, Firmino, Kante, Niguez, fofana...are names that joined or will join Saudi Arabia league!
For Mbappe, I think it is random to think he will agree moving to Arsenal, this if we suppose that they have enough funds to bring him there.
Well, I agree with you, they continue to improve by recruiting top European players. Even though their average age is no longer young, the big names of these players have at least made the Saudi Arab League famous. For the initial stage their steps are right. And everyone needs time to prove it, with the presence of the names mentioned, it is possible that in the future they will recruit trainers who have the reputation and experience of champions.
With full support from the government to invest in football making their plans even easier. That way the image of the Saudi Arab League will be boosted for the better, at least it can compete with Ligue 1 or the Bundesliga. Automatically the presence of quality players and coaches in the Saudi Arabian League will make the League more complete and competitive.