Hi first,
I personally think that we will have some war in DU. But between only two larger orgs.
From the strategic point, there will be at least two sides in DU. The Pirates and the Settlers.
There will be nearly no big battles because of coast per ship but a permanent war with smaller ships and
with tactics from modern guerrilla wars and the sea war of the second world war.
The pirates will nearly not attack decide which ships they attack and they will first attack lonely ships.
Maybe they only take the goods from the ship or maybe the whole ship or...
After some time there will be more and more trade convoys which later gets protected
from some special orgs or the military of some orgs.
Then we have the same situation like in World War II on the sea, where no one will win something.
From there it will be too speculative to say something. It is important to know that this is only one possible scenario of DU.
There could also be peace, what I prefer.