From what I've seen as far as members leaving and then coming back. Most of the state that they either left for personal reasons, or from the negativity surrounding both GM and the fights and hostility that would go on between some members.
If you just join a site and see someone ripping apart other people for seemingly harmless things, would that make you want to stay? I think most of the fighting has calmed down, which is a good step.
Another key step is to get exclusive news more often. Thanks to Ted's sharp eye, we did manage to get some. We just need more of this sort of breaking news. How we get it, is a good question.
FWIW evok does still come and post from time to time.
As far as C&G goes, I what has always drawn me to this site is both the community and that interesting discussions go on. It's not all one-sided discussions and arguements, which is rare for any automotive fan site.
We have a long road ahead of us to bring the site up, but I think we've also made a lot of good first steps, and we have a dedicated leader. It just takes time, just like it will take time for GM to recover.