Don't think it's a huge secret that CC is currently a bit quieter than it has been of some times in its past - earlier this year, or back in early 2005 for instance.
Here are some names who have either left (hopefully temporarily in most cases) or basically never post any more:
marc71178
Neil Pickup
Jono
superkingdave
Scaly piscine
tooextracool
aussie
Voltman
benchmark00
C_C
Sudeep
Adamc
Slow Love™
Top_Cat
FRAZ
_Ed_
masterblaster
The Baconator
Samuel_Vimes
Waughney
Jungle Jumbo
chris.hinton
cricketboy29
Pedro Delgado
a massive zebra
LongHopCassidy
16 tins of Spam
Steulen
BlackCap_Fan
And some who've been absent, temporarily, recently:
Mr Mxyzpltk
Craig
FaaipDeOiad
SJS
Pratyush
adharcric
PY
Barney Rubble
Tim
twctopcat
Now, of course, losses like these - all bar 3 or 4 of the above the forum would be better with than without them - will always have some impact. There have been quality newcomers - to name some who've joined in the last year or so:
pup11
Pup Clarke
Athlai
Flem274*
shortpitched713
Raghav
HeathDavisSpeed
Nishant
The Sean
cover drive man
Poker Boy
1-9-7-7
headhunter
stumpski
NUFAN
(Let's note - this is BY NO MEANS an exhaustive list)
So there are ups and downs; obviously, ideally we'd like the ups without the downs, but the sad reality is that life does change; most of the departures named above have been because people have been doing stuff (mostly education-related) that has meant they've had less time or less ability to get net access than they once did. And as I say - while this is a great shame, it's almost unavoidable.
Nonetheless, I doubt any would be sorry to see the return of the likes of Matt Pitt, tec, Corey, Jesse, Marc, FRAZ, amz, etc. And if they ever do return, CW will be the richer for it.