I'd rather have Akainu not fall for Luffy's toon shit. Popping eyes and stars upon his head? Vile. Second best choice is Fujitora for the supposed new and better reformed marine HQ. Although I also see no reason for Sakazuki to fall. He will most likely fall,but the extermination of pirates isn't wrong per se,you only think of that due to some few supposed good pirates.
If the world is set to be freed these pirates and the next gen won't be pirates but adventurers. Free roamers of the world,there is no reason to hunt them now that Imu and the great evil of the world will be exposed.