I see, but what do you think is the solution to keeping and gaining new fans of football?
Honestly? I don't think there's a way. Or if there is some, then it certainly isn't Super League, at least not as a long term effect.
I think people with Internet gained way more possibilities and sources of entertainment. They get to pick what to do and at young age it kinda forms it as a hobby which later on turns into passion. I see kids today train football in a lesser extent, but not a huge difference, but I see them rushing from school/training to play video games. Training is turning into a thing just to make parents happy while their free time is focus on video games (speaking about boys as girls are more focus on more stupid things). The overall quality is worse compared to the past as players are generally worse even with a lot more money in the game. Leagues are less interesting, especially Serie A imo. I knew tons of people who used to follow it but dropped interest. Majority of interested in football here follow EPL, but on average interest in football drastically dropped as only "us" long term fans are in the game, younger generations care less. When you see Bayern - Juve in 1/16 there's not so much interest, at least compared to the past. It draws more attention only if its semis and finals.
In my hometown there's Partizan. Their young academy was the best one in Europe, even better than Ajax (info from 5-6 years ago, dunno how it's now). People from the academy want to get into senior team and play the CL so they show themselves. If they took that away from them, since they'd NEVER get the possibility to play against best teams in Europe, my guess is they would care at lot less about the game. They are all against it here.
Video games are becoming a big thing. It gives possibility to get income monthly higher than doctors and possibly if you're good enough even earn millions. Kids are becoming lethargic, they hang out less, and focus goes on video games. They don't even have buddies bar online ones. They want to compete online and they want to live like it and have it as a profession. I see plenty of kids streaming of some sort here. If they start getting cash they are getting green lighted from parents. Video games by default require you sitting 5-12 hours infront of a PC. They care more about getting money themselves rather than playing football and by default that means less interest to watch it. I see hundreds of thousands people following e-sport tournaments, even when it's their knockout stage. Again, I'm not saying that's a great thing, I just see that as a new wave of future generation where we'll see less interest in football each year. Fan base is gonna lower a lot when both Ronaldo and Messi retire too. As for the generation of players there are only Mbappe and Haaland who're breaking through, but imo both will draw less attention and interest compared to Ronaldo and Messi.
I think they have to face the fact that money and bigger budgets won't make football better because over the past 20 years as clubs grow we see that quality of football went down.