Its not about Floyd and Conor, as no matter what event you put on, you can only house whichever fighters are currently around. No one is doing it better than the UFC, and even another promotion would still be using these same fighters, as they are the top of the food chain, being fed into the UFC by the best gyms.
However, if weidman keeps losing, if Rockhold doesn't bounce back and how so many fights could potentially play out, things could get very stale.
Bisping facing George, could look bad for either one unless its an all out war or one wins in spectacular fashion. Yoel, and Jacare do not have the bigger american following yet. Vitor or Andersen towards end of the career. Mighty Mouse, Cowboy, Cruz, and the regular crowd are all floating.
Things could get stangnant for a bit. Overeem, Hunt, all these known guys of the old guard in a sense will be out the next few years.