If wano is one piece Japan, it only makes sense for it to get nuked by Mother Flame.
By using the weapon on the walls of wano, Imu will destroy the defense that has kept wano secure for centuries. This will allow the WG to mount an attack against wano kuni.
Wano will be captured by the WG, leading to Momo, Yamato, and Kinemon fleeing and joining the SHGF.
The WG will get Pluton, forcing Franky to build another pluton, probably with the help of Iceberg and Water 7.
By using the weapon on the walls of wano, Imu will destroy the defense that has kept wano secure for centuries. This will allow the WG to mount an attack against wano kuni.
Wano will be captured by the WG, leading to Momo, Yamato, and Kinemon fleeing and joining the SHGF.
The WG will get Pluton, forcing Franky to build another pluton, probably with the help of Iceberg and Water 7.

