ONE PIECE GOLDWarning: Contains spoilers about Chapter 786!
First, we know Oda announced the Zou-Arc for September this year, which means, there are only about 13 Chapters left (including weeks without manga), so everything that will happen now will happen really fast!
We saw that Doflamingo ist still able to fight and Luffy needs at least 10 minutes to recover. Sabo, who will fight Burgess, is to busy to mess with Doflamingo. And, to be honest, all the former Colosseum-Fighters cannot keep Doflamingo for even two minutes busy. So how will Luffy beat him?
The answer is: he will not! There is one Group on Dressrosa which didn’t make it’s turn until now. And this is the CP0! They will attack and kill Doflamingo, but are not interested in fighting Luffy or Sabo.
So, why would a Governmental Organisation fight a Shichibukai? Doflamingo ist no ordinary Shichibukai, as a former Tenryuubitohe knows all the secrets of the World Government and ist one of the biggest threats for them. The reason to kill him so is clear. But still, the CP0 didn’t come Dressrosa to eliminate Doflamingo, but to keep Dressrosa in Peace. When trying to kill Doflamingo, they have to get direct orders from their Boss! The Den Den Mushis don’t work because of the Birdcage. So, the Leader of the CP0 must be present on Dressrosa!
And why are the CP0 Agents not interested in Luffy or Sabo? Let’s just say, they are not their first priority. Sabo will easy beat Burgess, or at least escape him, he will take Luffy and gets him out of Dressrosa. After the Death of Doflamingo, the Birdcage will collapse and the People will celebrate. But the Pirates (Law, Batholomeo, Robin, Usopp etc.) will escape as fast as they can. They will first meet again on the sea.
Dressrosa will become property of the World Government, either under Control of the royal family or with a new King.
*Theory by Borschtel