It's been hinted on more than one occasion that Luffy's is going to put an end to BC as well as Joker at the same time. No devils fruit power is automatic. Joker or any fruit user for that matter has to control his attacks for them to be effective so if Joker gets defeated then it'll make BC disappear or stop. Do you think Pica's statue can fight on it's own even if Pica gets KO'ed? No. Same goes for any fruit user which includes Joker. Zoro even said if the bird cage is still around then it means that the one who's responsible for it is still undefeated indicating that defeating Joker will stop BC.
Once again the last attack was too lame to be the final blow. There are no OMG faces , no tears, no surprising faces, no happy movements,no fanboying movements and no praises from people around Luffy which hints that the battle is far from being over. If anything Zoro movements against Pica are more epic than ending of today's chapter. Do you seriously think Oda would end Luffy's battle without greatly outshining Zoro's battle? Not a chance in hell.
As we have seen with the battle between the admirals the island is still burning from fire the admirals created, the reason Zorro said that the bird cage still being up means that Doflamingo hasn't been defeated means that he believes that defeating him will stop it, but neither Doflamingo or anyone who knew about bird cage before hand ever confirmed that belief, that would make sort of a twist that stopping Doflamingo doesn't stop the bird cage.
So its very possible that the bird cage will still work even if Doflamingo is defeated, which would be why its Doflamingo's trump card, and it would act as the climax of the arc with the Straw Hats working together to stop the bird cage.
Also the hero only beats the game changing move of the bad guy in the final chapter of the fight, the fact that the awakening ability was introduced in this chapter and beaten by Luffy shows that its the last chapter of the fight because if it wasn't Luffy wouldn't have overpowered it, because that would take away the suspense of the main villain having it.
If there was going to be another chapter of fighting, the chapter would have ended with Doflamingo smirking and saying that he is just getting started or some other bad guy speech and creating more thread from buildings or introducing another awakening ability, or something along those lines.
Doflamingo getting sent flying into a mountain after introducing this overpowered attack means that the fight is over, and this chapter had every aspect of the ending of a Shounen battle.