The UEFA is so far ahead that no matter what they do in the Asian area, they won't close the gap at all for the next five decades. Only if a dozen states decide to take tons of money and pimp their national leagues. But they would still have to convince South American and European players to go there. It's not enough to get some almost retired players like Ronaldo and some money grabbers. They would need the next Messi, Mbappe, Modric, Zidane, Robben, Ribery, Maldini, Buffon etc. That's when people from all over the world would start watching those games on a regular basis. Now it was only short term hype because of Ronaldo.
Saudi Professional League are building and it's not true to say they will fail. They need to do more especially things in youth academies to grow up their home grown talented players who will be future of the league and their national team. If Saudi Arabia can invest into their youth academies better and in long term, they can get massive success like Japan. We knew that Japan started their ambitious plan with a Brazilian player Zico and after about 3 decades, we can see how their Japanese League 1 and Japanese player quality are now. Their league is one of best, or can say the best in Asia continent and Japanese players now can play at world class level and are key players in big clubs too.