Is The UFC In Decline?

This question has been circulating a ton lately. Where are all the new huge superstars in the UFC. Conor and Jones are on the way out. Alex Pereira is enjoying a ton of new fame, but is he the only one? Even then it's still early for him. Sean O'Malley is struggling to sell out the overpriced Noche card at the moment. Not to mention there have been some truly awful fight nights lately. It all begs the question.... is the UFC in decline? Did it peak a few years ago and should we be worried as a result?