I still think this will go on for years because they always seem to be adding quality to their team every year, Last season they signed Bellingham and now they have signed Mbappe aand i am certain they will continue to sign improve their squad. Barcelona seem to be far behind in term of performance but we don’t know if things will get better with the new manager Hansi Flick.
Even though Barcelona can perform better, I believe it will still be difficult for them to become La Liga champions next season. Real Madrid is truly superior. They dominate Europe and are the best club in the world this season. Next season they recruit Mbappe and Real Madrid will have a pure striker. This means they will be much better next season. I even bet that Real Madrid will win the Champions League again. But at the European level anything can happen. But I have no doubt they will again become champions of La Liga and the Spanish Super Cup.