000 is a dream sequence so in some respects it IS over once Chaos is slain. For the full analysis, I direct you here. (NOTE: Squall_of_Seed was the one who suggested this question to me in the first place)
It's a nightmare Shinryu condemns Cid to in his anger over Cid taking a side in the conflict and breaking the rules of their contract. The warriors of Cosmos/Chaos were unaffected since the nightmare took place over the thirteenth cycle. So Dissidia's world B goes, everyone ends up back in World A (Final Fantasy I's world) and the heroes all go home.
That is until they all turn into dancing chibis for cycle 014...
SORRY, RL DRAGGED ME AWAY
It's a nightmare Shinryu condemns Cid to in his anger over Cid taking a side in the conflict and breaking the rules of their contract. The warriors of Cosmos/Chaos were unaffected since the nightmare took place over the thirteenth cycle. So Dissidia's world B goes, everyone ends up back in World A (Final Fantasy I's world) and the heroes all go home.
That is until they all turn into dancing chibis for cycle 014...