I think after Elbath..we have to deal with the last Road Poneglyph which is probably gonna be a shorter arc but will give us a good bit of exposition and let us check in on the state of the world.
Then when we hit Loadstar/Laugh Tale everything instantly hits the fan and doesn't stop until Imu gets punched in the face by Luffy, I don't think there is going to be a separate War for Laugh Tale and overthrowing Imu because whatever else is at Laugh Tale..is a direct threat to Imu's rule that he has to mobilize the moment that someone indicates they are going to Loadstar.
Buggy is kind of not wrong, The Final Push to laugh tale will be a scramble...because as soon as one person moves EVERYONE else has to.
One Piece is a big ole piece of meat on a plate, Luffy, Shanks, Imu, Buggy and Blackbeard are all still hungry and are staring at each other..waiting for someone to make a move for that meat...the moment someone twitches a finger towards the plate it becomes a...Loney Toons Style Free For all where everyone is trying to grab the meat while preventing others from getting it.
AND OF COURSE...Luffy is going to be the one to reach for the meat first because he is the only one who really doesn't care about what other people might do...because he might be the Smartest Shonen Protagonist...because he understands the rules of the world he works in and that SOMEBODY has to make a move or everyone sits on their ass staring at the meat.