Some of these players from the Saudi pro league side offering enticing salaries and wages still has other things to consider before a move to that side of the league, especially their participation in the European competitions such as the champions league, Eropa cup etc ,especially as a young or upcoming player the Saudi league isn't a suitable place to move to as you will be missing out in most of the things you have to showcase your skills or some football achievements you need to attain.
Players are now getting the cheat code, young players are now going to the Saudi league to player one of two seasons, secure the biggest bag and then come back to the English premier League. The Aston Villa ex star did it and the young Spaniard also did same.
In the future these Saudi teams will start finding solution to secure these players for longer term.