The big issue I see is the financial roadblock that's an inevitability to come. Conor will keep wanting more and more, and each time the UFC acquiesces it's coming out of their end, and there is a wall coming soon. It might even be here, because truthfully, none of us will ever know what the UFC's real expenses are when it comes to putting together an event.
Using loose estimates (I'll go with 1.5m buys at $55 (splitting the SD/HD pricing), the UFC PPV revenues are ~$82m. The broadcaster takes about half, leaving the UFC ~$41m for their end. With venue costs, marketing, insurance, flights and accommodations, fighter payouts, bonuses and other miscellaneous expenses, plus PPV points to the main eventers... the more they give Conor, they less they make on their end, and I believe there will come a point where they just can't give him any more.
Note that I'm not disagreeing about him bringing in sales and revenues, or that he appeals to a wide audience. I just see a point where the UFC has to say enough is enough (without having to give away the shop), and if Conor thinks he's entitled to "Floyd" money each time out, he's in for a surprise. If Conor tries to play hardball at the UFC's expense, I absolutely see them fighting to protect their own interests more than placating him.