I think it would be interesting if it ever happened, but I don't see this getting off the ground. I hope I'm wrong, but the only way I see this being an interesting show is if they featured people who have a lot to lose by leaving ... someone who has a lot of family in or a lot of friends. I don't think most people living in that situation would be willing to participate. (I wouldn't). I think the only ones they will get that are willing to participate are ones that are on the cusp of the witnesses, with few close contacts inside. The other type of people I see that might be willing to participate are very young JWs who want to leave and who may be a bit impulsive.
Personally, I don't think this proposed show will show JW's OR ex-JWs in a good light. (The former I could care less about.)