OK, no replies since your original post so I'll bite.
Dave (so far) has been very careful keeping the EEVBlog and his family life separate, there are some creepy scary people out there and he needs to be careful, especially as he is a public figure. If he wants to create a video post containing Sagan or Huxley then it's his call.
An example of this, when was the last time we saw Mrs EEVBlog? Or Huxley?