If the Super League had system of relegation and promotion of 4 teams from the top 4 leagues, would have Super League been a bad idea then??

It would've been okay but it should have more opportunities for smaller teams to reach in it ...now be it relegation-promotion or some other

I would say with relegation and promotion it would become a great league but what about the clubs in THE CHAMPIONSHIP, Bundesliga 2, all the second, third, 4th tier clubs wouldnt exist anymore. The prem wouldnt be the promise land anymore, and they wouldnt get enough tv revenue