i think he is capable but i think a better posision will be offered to him when the war is over... THE KAGE or to put it in other words... he'll be the head kage of a bigger military force that they combine.. and the kage's will be the generals but still called the kage... but of 5 diff factions consisting of each hidden villiage... for example...
Head KAGE/world guardian : naruto
naruto's right and left hands : Sasuke and Sakura
naruto's personal body guards: Konoha 11 (including sasuke)
faction 1, Hidden Leaf: Hokage/general
faction 2, Hidden stone: Tchuchikage/general
faction 3, Hidden sand: Kazekage/general
faction 4, Hidden mist: Mizukage/general
Faction 5, Hidden cloud: Raikage/general
they should erase there respective villiage from existence and pretty much move all of them to be closer to eachother to form one GIANT CITY with districts... and the names of the districts will be the names of there previous villiages...