If he is still following TTT, I'm thinking Kellhus' goals should be:
1. Destroy the dunyain.
2. Eliminate the consult & destroy inverse fire.
3. Exterminate the nonmen.
4. Ensure all the sorcerers in the ordeal die.
5. Fix it so the cish replace the thousand temples when the New Empire falls.
6. Die.
With the schools, consult and nonmen gone and the Cish priests running the theological side, the chance of the no-god project ever being taken up by anyone else is pretty much eliminated.
That's awesome! Although it makes it seem unnecessary/risky to kill so many Cish in the first trilogy--what do you think is going on with that?
Id rob and adapt some of your views to mine
Kallhus puts everything humanity has in one big effort to achieve his aims of taking over the consult with the aims of reincarnating the No-God. He will ensure in the process of reincarnating the No-God that the army along with the vast majority of mages are eliminated. Mankind is bankrupted and largely leaderless and will find it difficult to field an army. The lack of mages to use magic against the consult will also minimize any possiblities of failure.
Alternatively the matches he brings with him might be necessary for a sacrifice to brink back the No-God, maybe the False Sun was used in this way but another sacrifice is needed as his power was destroyed by the spear.
Another possibility, maybe the mages are neccesary as a sacrifice to power the Heron spear. Kallus is manipulating the Consult as he does everyone and needs to get the army close enough to the No-God to destroy it completely.
IMO I get the feeling that the army is going to be necessary in the end and have an image of Achamian turning up at the right time to save it with the rebels we've been seeing together the new leaders.
One we know Kallus needs that army and the mages for something and is trying to get them to survive to a certain point.