I've never seen any interest in these forms of show. From my (admittedly) limited exposure, the entire venture seems to be a self-congratulatory backslapping events. If it is to be done then it needs to be fully interactive giving fans the opportunity to truly react to production crew members.
What I would love to see (well, hear) is a podcasting by Fuller et al for each episode, made available shortly after airing, akin to Ron Moore on BSG/Outlander. I enjoyed that format as it gave Moore the opportunity to try and explain his/the crews motivations for storytelling, and he wasn't shy in critiquing himself either. That was limited in scope given it was mostly just him, sat in bed with a Whisk(e)y of the week, a cigar/cigarette and his wife randomly in the background. It could be expanded to the showrunner, the writer, the director, a relevant cast member and production team member (SFX designer, set designer etc) and a real, informative roundtable could bed had whilst the rewatching the episode.
Hugo - currently just hoping the proper show turns up on a TV station he has access to!!