LTC doesn't see much discussion in here either, but it's still the most well-known, accepted and valuable altcoin (not counting Novacoin's odd value). The number of front page threads about any given coin on this board tell us nothing about it except its newness factor and current level of hype.
CNC definitely does seem to be dead. It never really had a community behind it and the developer hasn't bothered to do anything with it. I wouldn't be so quick to write off FTC, however. There are a lot of people still working hard behind the scenes to make it a success. We may not be getting the play-by-play on it here in this board, but it's happening. Even with the support that it has behind it, its success cannot be guaranteed. Still, in the long term I'd sooner bet on FTC than any of the latest altcoins on this board. Yesterday both FTC and CNC made for fun trading as they crashed and then bounced back up a bit.
For the record, I have zero FTC in my wallet.