User blog comment:AYET/The worth of the Shichibukai to the Marines/@comment-6920514-20130529062507

The strengthening of the Navy doesn't make the Shichibukai unnecessary just a little more expendable. They are still assets the Navy wouldn't willingly make themselves weaker for no reason. Besides, each Shichibukai is a different individual desposing them all because of the occassional betrayal wouldn't make sense. It was because them that they were able to create Pacifistas and capture Ace without harming a marine in the process. The warlords have their uses and as we've seen so far with the Dressrosa Arc the WG can quickly despatch an admiral(plus CP0, some warships, and a vice admiral) to "deal" with the warlords whenever necessary.