Thats a thing i think since this talk about beating Yonko started.
If BM and Kaido fall after Wano the two biggest pirates in the WG vision, besides Shanks and Teach, will be Luffy, the leader of the downfall of the Emperors, and Buggy, friend of Shanks, was in Roger crew, leader of the breakout in Impel Down, was in the Marineford War, become a Shichibukai and have a huge number of followers.
I woudnt doubt If we got Shanks, Teach, Luffy and Buggy as the Emperors after Wano