Ok so.
This is not my theory, my friend talked to me about this today.
So, in the Contest of Champions contract, it states that if Dalinar's Champion loses, Dalinar's soul becomes Odium's to use and be served by.
My friend suggested that Odium will make Dalinar a fused, severing his connection to himself, making Dalinar serve only Odium.
He suggested that somehow, Dalinar would make it to Scadrial, and severe his connection to Odium somehow.
This would make his connection to anything and anyone severed, leaving him unresponsible to his actions, and making him view life in the third person.
I can't remember much else of what was said, but he said that this would lead him to becoming the hero of ages, or something.