Said question is essentially the topic of their disagreement on OB late last year, is it not? I recall that discussion reaching no satisfactory conclusion. My impression from that was of a great deal of talking past one another, not so much a matter of of approach to the question as subtly differing implicit assumptions.
Would the meta-topic be likely to shed more light on the subject, or would it result in the same stalemate?
I suspect there are more interesting and fruitful topics that the two could discuss.
It is much easier to talk past each other and generally avoid the central points of disagreement when communication is written rather than oral and in essay style rather than conversational style.
Bloggingheads.tv can't exactly call up, say, the President of France and get him to do a diavlog, but they have some street cred with mid-rank celebrities and academics. With that in mind, how would you fill in this blank?
"I would really love to see a diavlog between Yudkowsky and ____________."