Fuck I kinda like this…
Your not the only one!
! Her groom is Duval.
@Thousand:
The problem with BB being the final villain is that One Piece isn't going to end with Luffy finding One Piece. It will just be the trigger of a global war against the World Government. However if that's the case, that would ultimately mean that BB failed in becoming Pirate King. They're supposed to be polar opposites on an equal footing but that would be undermined if Luffy accomplished his dream and beat BB to the punch. I can't see Luffy just getting to Raftel and getting One Piece with BB being in the way so Luffy has to beat him to get One Piece. However if Luffy beats him, it'll just undermine him as a villain both thematically and story-wise. You can't have a final boss villain be someone the hero has already beat once.
I think more likely, it's going to be a situation where the final two D's fight for the right of One Piece and everything it entails, the right to rule the era as it were. The age of dark ruthlessness of BB vs the age of adventure of Luffy. Luffy will win obviously and earn the right to rule the era. The final villain though has to be someone from the WG probably Akainu. Ultimately the ultimate villain to the age of romance and adventure and freedom is the WG. Blackbeard is an evil bastard but he's not against freedom or following your dreams, quite the opposite in fact. So he can't really encapsulate the ideals that are so against what Luffy stands for. The WG is a much better fit for that.
This is the main reason why I think WG is the last boss. BUT, what if Luffy & the crew actually loses on Raftel or before and Blackbeard finds the One Piece first and then draws the wrong conclusions from it because he doesn't have the whole picture/hearing. Instead of Luffy he would be the one to start The War. It would make somewhat sense right? It's not like BB would just settle on the title of the strongest with just Roger's left overs from his bar tabs.
And lots of pirates would no doubt follow him against WG now that he has the title of Pirate King.