Saudi Arabia are doing well attracting these players to their country to play in their local league, if they continue like this, in a few years from now, their local league will become important and watched by people in other continents.
So many players with big names come to the spl. That's good. Messi is likely the next one.
First Cristiano Ronaldo moving to Saudi Arabia to play in their league greatly influenced how people viewed the league and increase the interest people had in the league. If Lionel Messi decides to join him in Saudi Arabia in another rival club it will further increase any interest people had in the league as it will attract the fans of Lionel Messi as it attracted the fans of Cristiano Ronaldo.