So?

And before that there was Stock Aitkin and Waterman, and before that there was disco.

Music has been dominated by mainstream pop acts for the last 50 years. This is nothing new. I'm a fan of 80s music, but if I were to remove my rose tinted glasses and listen to everything released in the 80s, I would be reminded that 90% of it was awful chart-orientated commercial poppy crud, by people who disappeared after a career spanning the whole of a year.

Cowell is just the latest king of pop. Removing him from the scene just makes room for another.