The World Government is not strong enough to win a war against Luffy and all of his allies. Mihawk himself said it, Luffy turns everyone to an ally.
Let’s just take a look at the people who could come to Luffys aid:
The Strawhats
Rayleigh
The Red Hair Pirates
The Revolutionary Army
Marco The Phoenix
Garp The Fist
Law (Potentially)
Kidd (Potentially)
The Samurai & Minks
The Grand Fleet
All of the Fishmen
Who do you think is or isn’t coming? Did I miss anybody? Can the government win that war?
Let’s just take a look at the people who could come to Luffys aid:
The Strawhats
Rayleigh
The Red Hair Pirates
The Revolutionary Army
Marco The Phoenix
Garp The Fist
Law (Potentially)
Kidd (Potentially)
The Samurai & Minks
The Grand Fleet
All of the Fishmen
Who do you think is or isn’t coming? Did I miss anybody? Can the government win that war?