I'm particularly perplexed by the claim that war would be solved by higher intelligence. Many wars are due to ideological priorities. I don't see how you can expect necessarily (or even with high probability) that ideologues will be less inclined to go to war if they are smarter.

War won't be solved by making everyone smarter, but it will be solved if a sufficiently powerful friendly AI takes over, as a singleton, because it would be powerful enough to stop everyone else from using force.