I don't fully follow the anecdata in this article. They mention that Berghain had to raise its cover charge to "deal with rising costs" (understandable, considering the inflation), not that they have fewer patrons.
And even if, if one club closes down it hardly means the end of the club scene as a whole. I qm not familiar with Berlin that much, but back the day the club in Munich was P1. Now not anymore, doesn't mean others didn't take P1s place so.