See, that's part of the problem, if the entertainment industry would listen to people instead of telling people what they want, this stuff wouldn't really exist all that much.
But, what they do listen to is money, and they look to the past to see what brought them that money. They know they can make shit movies and songs, so long as it involves popular people, based off something popular, or sounds decent.
Kinda like how the Big 3 here in Detroit tried telling everyone what they wanted to drive and wonder why they're being pushed to the poor house while people swap to other manufacturers.