Forum:'The battle that will engulf the World'

Whitebeard said at the end of the marineford war, that there would be a 'great battle' when One Piece was found

I wonder if Oda will make One Piece 1200 chapters long, as there's so much to answer and resolve. If Luffy found One Piece would that mean this battle would happen after he found it? I wonder if Luffy earning the title of Pirate King will be similar to the events that transpired after Roger? Would he would go to war with just the government over the truth about the Void Century, or would all the yonkou, revolutionaries, strong pirates AND the government be involved in a free for all? What are everyone's thoughts on this?