I can see how in a conventional game with storyline and characters and preprogrammed behavioural responses, using chatbot style AI to gauge the intent of things a player speaks into his microphone would feel more naturalistic way of getting canned responses than clicking on a multiple choice dialogue (even though it'd effectively be all multiple choice options under the hood). There are more gameplay options when players have to figure out what words to use to unlock a certain response rather than just picking the most promising option from a dialogue tree too.
Though I guess what's theoretically very cool could just be a lot of NPC's saying "I don't know what you mean" and "stop bothering me" 99% of the time, players finding amusing verbal tricks to dupe the AI into believing they've said something that means the opposite of what they actually said, and players getting incredibly frustrated that the game doesn't understand their accent...
