I would disagree with your point about how we answer questions, we optimize for comprehensively sound and valid answers, not for statistical adjacency. If someone says a whole bunch of techno-jargon or other word salad just to sound convincing, the wisdom of the crowds is already powerful enough to call that redundant. Likewise, the wisdom of the crowds can break GPTChat and there's already actively collected techniques to "jailbreak" the application.
My point is that a general conversational model is a gimmick at this point, and likewise GPT4 is already prescribed to have limitations like being text-centric and is not multimodal. It'll definitely being uncannily entertaining as a conversational homunculus, but a homunculus does not a singularity make.