It’s no mystery that the Warlord System is a sensitive subject when it comes to the forces of the World Government. The Marines are essentially working together with their enemies and this has been shown to be tricky on multiple occasions.
Pirates will always be pirates. That’s a lesson the WG has learned the painful way in both Alabasta and Dressrosa. In both cases, a Warlord was acting like the good-guy towards the citizens of the islands, but in the end, they were the ones responsible for all of the problems.
Now that Doflamingo is locked up, it might be possible for the WG to abolish the system now that it’s “weak”.
One of the things that would change after the abolition of the Warlord system, is the control the WG has on the seas. The amount of rookie pirates that enter the Grand Line would surge. The Warlords would no longer have the task to minimize this group, this means that more people will survive the Grand Line and this news will also convince even more people to attempt the journey. This could lead to more prominent rookie pirates that would rise like the worst generation did before them.Another result of the abolition would be the fact that the Warlords would become enemies of the Marines again, not even considering the fact that new alliances might emerge between ex-Warlords, maybe even some super rookies, or even a Yonko.
We have to consider that the seas are a dangerous place at the moment. Like Doflamingo stated, there’s a big war coming now that Whitebeard’s era is over. The current Yonko are all power houses and some of them are creating bigger and bigger forces. Kaido is creating a zoan fruit army prepared for war, and Blackbeard is collecting devil fruits for his crew and his ambitions are a danger to the WG too.Of course the Marines and World Government have a lot of powerhouses for themselves like the Admirals, the CP’s, the Vice Admirals, Vegapunk’s PX army, and old legends like Garp, Sengoku, maybe even Kong. There could even be people that work for the WG that we haven’t even heard of, but the fact remains that abolishing the Warlord system would severely shift the balance of the world in the favour of pirates and possibly even the revolutionary army who could use this opportunity to strike.