I've seen this argument made against, "All music today is crap!"
There are definitely cycles in music which are more exciting and innovative. But usually they're out of sight in some kind of regional scene or underground where they can develop while the mainstream scene is a bit bland.
However, the music business has changed so radically over the last ten years that I'm wondering if that's possible anymore.
Bubblegum, to cite an example I know well, used to be driven by independent producers. Studio insiders and hustlers who'd whip something up and get it out onto the market. But now Bubblegum is driven by huge mega corporations who see it as an extremely profitable genre with a built in audience.
Disney's vertical integration allows them to create an act, put them on TV incessantly and play them Radio Disney and then get them on some ABC show as well. Even the Cheetah Girls made a lot of money, and (in order) High School Musical, Hannah Montana and the Jonas Brothers all made billions. Not hundreds of millions - but billions. And most of that is from the ancillary marketing - the Jonas brothers pillows and Hannah Montana lunch boxes. Though the tours are also incredibly lucrative.