I don't really find it weird that people move on from forums.
Wildcat used to live in a village down the road from where I live, (based on the weather where you are threads) she was young, and so most likely got busy with a job, or going to school etc.
SCC456 was last seen getting married and buying a house. so I expect he got a bit busy. it's not the first time he'll have disappeared for ages without a trace only to come back and start posting again, (coincidentally he lived about ten miles in the opposite direction from me to what Wildcat did!)
Ipwn was threatening to leave his IRL job not so long ago, so I think he may be busy with work and life and such.
Jmacavali has said in the mod lounge that he is very busy with life.
With all these people I would assume that they will come back.
(every long term member myself included) has at one point going from checking in every day, to having a break for one reason or another. and most come back eventually...
(e.g. David Lindon came back, VampirE came back...)
I wonder whatever happened to DudeSe, last time I recall speaking to him was years ago when he was heading off to start university...
99nash has been MIA for a long time now. same for alvino too, G35x, Arrizx, Kage, Atomic rooster, Mark thorpe, raffaz...
the "biggest" old name, that just sort of vanished without trace is Lord Kalthorn, the guy used to make loads of posts every day, (I just looked at his profile page, this very day (spooky conincidence) 9 years ago he made. 41 posts in a single day (not unusual!) then made 1 post in the past nine years, (most unusual).
I do wonder what happened to that guy!