Strangely enough, that's not a too dissimilar situation from Real starting a cup competition, which became the Champions Cup and now the Champions League. Except for two factors - the football structures, both domestic and international, are far better established, and there is a qualification scheme for the tournaments. The CC started as an invitation tournament, but evolved to its current format. Would the Super League evolve into a "top tier" for the CL? I'm not too sure...