Actual WT doctrine is, that Jehovah will solve this problem in a simlar matter (maybe special radiation), like Noah and his familiy had nothing to do with dead bodys.
Gerritt Lösch told on his last Zone visit in Europe (2011) the total opposit - that we will have to bury all of the dead bodies - but the actual WT literature does not support this.
*** w73 6/1 p. 346 A Cleansed Earth ***
The prophecy of Revelation also describes the destruction of Satan’s earthly forces, giving the invitation to the birds to come to “the great evening meal of God.” (Rev. 19:17) On a previous occasion an avowed enemy of God was devoured by dogs, leaving only a few bones to bury. (2 Ki. 9:30-37) But the animals could never dispose of all those slain at Har–Magedon. Hence, the Almighty God will doubtless use some highly scientific means at his disposal to get rid of the surplus of the decaying bodies in a speedy and sanitary way. We remember that Noah and his seven fellow survivors of the global deluge were not burdened with burying the human victims of that world catastrophe after they came out of the ark and renewed Jehovah’s worship on earth.—Gen. 8:18-22.
*** kj chap. 20 p. 377 par. 22 Land of Magog No More to Threaten Mankind ***
22 The fact that Jehovah leaves the bodies of those slain at the defeat of Gog’s attack lying exposed on the ground for birds and wild beasts to gorge themselves upon symbolizes that they will not be laid in respected memorial tombs in hope of a resurrection for them. The unburied dead, “those slain by Jehovah,” will be so enormously many that even the carrion birds and scavenging wild beasts could never take care of their consumption. The burial of even what remains after these lower creatures have their fill would be stupendous. Doubtless the Almighty God will use some highly scientific means, whether including antimatter or not, to dispose of the surplus of decaying bodies in a speedy and sanitary way. This remains for the survivors of the “war of the great day” to see and witness. We remember that Noah and his seven fellow survivors of the global Deluge were not burdened with burying the human victims of that world catastrophe after they came out of the ark and renewed Jehovah’s worship on earth.—Genesis 8:18-22.
