With Naruto instead of Luffy, talk no jutsu
could work on Akainu, if the FA is shown that a more fair WG is possible without the CDs/Gorosei/IMU and by implementing pirate- and revolutionary-based ideas and personnel.
But with Luffy? The dude liberated Impel Down serial killers and allied himself with mob bosses and civilian crucifiers. If I were Akainu, I'd never believe that Luffy has the best for the world in mind.
The Marine's iron fist > pirate chaos > CDs' genocides & demonic shit.