You're not wrong. There was a similar thread over at the Bigfooty discussion forums on the Claremont Serial Killer, but it has recently run into problems with the tinfoil hat / numerology brigade as well. Don't get me started.
There are still some sane contributors on these boards. I try to log in every now and then just to see if there are any updates...but it's only an occasional thing, at least for now.
Thing will of course pick up a lot whenever there's actual news stories relating to the CSK.
As for the "martial arts guy" on the CIA episode...I have certainly been intrigued. Obviously, he didn't really add much to the discussion about the women, so it's a bit "strange" why they didn't edit him out of the program. Unless of course the police might have thought it would be helpful to get his image out there before a wide audience.
If you check his background (which required some creative Google searching, e.g. for financial market dealings, etc) you can see that he is definitely wealthy, definitely of English descent (e.g. his first name is a very English name), and definitely a martial arts practitioner/expert. One concern, however, is that in photos of him on FB or elsewhere taken from aroung 1996/1997 he doesn't quite appear to match the "Mystyery Man" in appearance, or possibly in height. Our martial arts expert appears to be a bit shorter, and his hair at the time appears to be of a different style. However, it is HARD to judge these things, and I'm not certain...I'm just leaning that way slightly (re: his physical appearance at the time not matching Mystery Man's).
But yeah...if the police wanted to try and "jog" the public's memory, then the tactic of getting "Martial Arts Man" on the CIA episode, and then describing the "well-educated English martial artist" key suspect would be an EXCELLENT idea!