Anyway... The point of this discussion was to consider that the World Government as we know it may be replaced by another form of government that isn't ruled by the Celestial Dragons later.
SWORD may be the precursor to the new government if it happens to disagree on key principles that are currently upheld by Celestial Dragons and figures like Akainu and those in the Cipher Pol group who have, in the past, committed crimes against the world.
In this way, Coby, Smoker, and and X. Drake may become the new Admirals of the new government.
It is also possible that SWORD will actively resist the World Government by siding with the Straw Hat Pirates eventually.
They will not take over. Side with the SHPs? Sure. Assist in some capacity in the new government? Sure, but they are not going to be precursors to another group of people technically ruling over Kings and Queens of sovereign nations. I really don't think that after Luffy wins the final war that the monarchs are just going to let another group take over to tell them to pay tribute to some assholes that live at the top of the world. Or undersea. Or wherever. Because then, nothing would have changed. Might as well have another Imu too. So I think the Monarchs will band together somehow and have coalitions and assemblies so that they can make their own decisions so that in a sense they can all be "Free" as Luffy might put it.
Smokey and Drake is not going to be admirals, not this soon anyways, it'd be well after OP is over as these two just doesn't seem like they'd get their strength up to Admiral level by the end of the story. Coby is a stretch too but his growth is amazing.
Sword as precursor to the new government no. The new government would fall on the Kings and Queens of the world and the Revolutionaries not Sword.
As for sword defecting maybe maybe not. As they are right now they are just a Black ops unit with more wiggle room than the regular Marines just allowed bend or break certain rules like confronting the Emperors.
Damnit as I was reading this I was like BLACK OPS!! but then you get to it first...
That's a good point. With the gorosei/imu/tenryubito removed the path would be quite opened for the WG to become what it has pretended to be for the past 800 years. Member countries would make up the world's governing body... it's not a perfect scenario but it's one that spares the world the power vacuum of the world government potentially disappearing and enables the marines, which are actually important for the purpose of keeping pirates at bay, to continue operating.
United Nations type of scenarios or a bunch of regional blocs like NATO, BRICs, ECOWA, ASEAN, etc. But I am leaning more towards the UN. Since the revo army consist of people from different countries it might make sense for them to become the body that patrols the oceans to keep everyone at peace while being fair where individuals countries/kingdoms will only patrol their own land and nautical space. What should define a country's nautical space? It is where the weather has stabilized to equate to that island's climate/weather. This was discussed when they got near Drum Island. They knew they were near an island because the weather, while it was cold af, has finally stabilized. Anything outside of that zone would be outside of that country's territory. I wonder if this is already the rule, I don't think Oda has ever stated where a nation's territory starts or end but using stabilized weather is a fair indication I think. This way, the revo army will have a higher purpose after the war and the ruling United Nations' members can enjoy their own freedom within their land. The Sea? Well the rest of the sea is for everyone and anyone to enjoy, courtesy of the new Pirate King's endeavors.