Well FS-5 does exist and was produced, I think Aidas was telling me that he saw one. Zenit AM - I'm not sure why you put that on the list, it sits happily on my shelf and I think a few other collectors' here as well...
You also forgot to mention the FED 6TTL, FED 7 and the whole Almaz fiasco :)))
The collapse of USSR, the Perestroika and the start of privatization had led to an utter chaos in factories and organizations.. a lot of stuff had been scrapped and reorganized (although it took many years).. FED has dropped all of camera production, so did mostly BelOMO. KMZ tried to do the same although the Horizon line seemed to generate much revenue so I guess they decided to keep going with it.. plus I think they started to seriously compete on the market with the lenses, since they world discovered the excellence Russian optic quality for a bargain price so they've kept going on those as well... and Lomo... I'm even embarrassed to mention them... the great GOMZ, succumbed to be - pardon my French (no offense Alain, Michel, Jacques

) - a bitch to a Lomographic society

, well I guess you don't pick and choose paying customers... it did turn out to be quite a gold mine for them... I just hope they do decide to come up with something new at some point and stop just refurbishing 1980s cameras... sorry for the rant

... just wishing for the fallen giants to get back up. I wonder how many original camera engineers were left on these factories?