True, he has contributed significantly to the popularity of the Saudi Pro League. I believe the main concern must be how Ronaldo was able to attract many European players to the league and I believe the most important factor is the money invested by the Saudi Pro League to acquire him from another club the big salary offered by saudi pro league has been also making some good players are interesting to go there. Even mahrez who has been playing for city was also going there caused by he received greater salary to play for al ahli.
It should be noted that Ronaldo would not be coming to the Saudi Pro League without receiving very large offers from Al Nassr and money plays a very important role here. He has played an important role in the club's acquisition of many European players up to this point by giving the best example how to give good offer in order to attract european players to join in the saudi pro league. That is why many people in the Saudi Pro League admire him, but it saddens me that Ronaldo will be trophyless this season. I can't really accept it because Ronaldo was the only player who was constantly carrying his team. This is why missing him will be disastrous for the club.
I can't imagine what will happen to the Saudi Professional League if Ronaldo isn't in it. I am convinced that the club's popularity will plummet dramatically like a roller coaster once ronaldo will retire from there.