An obvious application would be creation of rich (MMO) worlds where each player goes on unique quests. IIRC NovelAI (one of the AIDungeon clones) is working on

An obvious application would be creation of rich (MMO) worlds where each player goes on unique quests. IIRC NovelAI (one of the AIDungeon clones) is working on this. Also: Open-ended NPC dialogues.