And at least for my photography and my lenses, 24 Mpixel is enough to make any output I'm ever going to need to make. It's already more than enough, in fact. I'm not one of those who customarily makes wall-sized prints—if I were, I'd likely find the scratch to invest in one of the Leica S models mentioned. I'd bet the same is true for the majority of photographers.
I believe strongly that there really is a point where enough is enough: Photographs don't always benefit from more, more, and yet more. Photographers even less. No matter what a manufacturer might want you to believe.