But an artificial waifu would not require the whole Descartes party trick in the first place.
If we were to discuss philosophy, reference materials + markov chains + grammatical analysis would provide a better conversation than most 3D women could ever hope to provide.
We need to make progress on more important matters, such as figuring out the right approach to achieve strong artificial tsuntsun, or do the speech synth & cogsci research necessary to maximize the range of emotional signifiers available in speech to make every utterance of "Onii-sama" a unique experience for the end-user.