Me? Thats been my point all along lol.
Imo, Shanks is the endgame. Tied in with Oda's comments about the character, how all of this relates to One Piece, and his hidden motives, I don't believe BB "is" the end of the story.
I do however believe Shanks and BB are AT the end of the story together. Many sides will collide in the final arc I'm sure, but I think this story physically ends when Luffy returns the hat (whether that's bitter sweet or not) and not before.
We have to remember that Oda claims the ending has never changed. Blackbeard wasn't a concept in Chapter 1, but Shanks actually was.
My personal opinion, hopefully people don't get offended lol