If Real Madrid were to shift from La Liga to the Premier League for some reason, I think La Liga's popularity would drop by more than half. Earlier La Liga was quite a popular league but gradually the popularity of this league decreased while the popularity of English Premier League increased. If one of the most popular clubs in the world moves to the English Premier League, I don't think anyone will follow a La Liga match. Real Madrid and Barcelona are the main reasons to follow La Liga now. And the two big clubs in La Liga are Barcelona and Real Madrid and when a match is held between these two teams, that match is the most popular match in the world of football so if a popular team moves to another league, it will naturally have a serious negative impact on that league. However, it is not known for sure whether Real Madrid will change their league, but since there are rumors, something like that could happen.
That is only just a bluff by Real Madrid and Perez, nothing like that will happen. I mean think about it, are they going to just increase the number of teams in premier league? Are they going to ask every other team to respect the decision? Championship teams will pick one that will not promote?
Spanish team will be flying to England every week? That is not going to happen, it's a bluff, and I can promise you that it is just a way of perez saying "give us some favorable referee decisions" that's it. Which, la liga will do, Real Madrid always gets it, sure this week wasn't one of them, but they will get it, big clubs like Barcelona and Real Madrid get favorable calls against smaller teams all the time, it's unfair, but it's how it works.