User blog comment:AYET/The worth of the Shichibukai to the Marines/@comment-4904935-20130530233646

Because of the risk involved with maintaining the three great powers, the Shichibukai will probably exist as long as the four Yonko exist, plus the WG needs them for war purposes and to show the people that these powerful pirates are under their control. When the new age, the $#%*storm and all hell breaks loose, which it has been promising to do since the war, every man will stand for himself, or for his allies, and no pirate will pick the WG side.

A pirate will always be a pirate, Akainu knows it, so I am sure the marines are prepared for this betrayal.