I have to say I agree with Hollomandious.
Some concept art and sketches can help the team to still affect the listeners imagination regarding the characters and scenery, but video-storytelling would be a bummer.
A lot of things that cause tension in audiodramas just don't work as well with video, so it'd require a lot of effort to rewrite everything.

Add to that the fact that this podcast is made by people who have jobs. The extra time required for filming and editing, getting props and decors done, lighting and make-up simply isn't available.

So again, more concept art would be great, but I can't see much good coming from a video version.