From the conclusion to my second email (linked above; emphasis added):
Now. I could keep this up for the indefinite future, posting statistics about how other sites are literally 1000x more active than SL4 is. But if all the points I have presented are insufficient, then it's hard to see why simply repeating them with slight variations as the statistics change would make them sufficient. I'm done; my case has been presented. I'll stick around for a month for whatever is left to discuss, and then unsubscribe - voting with my feet, as it were.
Usually you're better than this.
EDIT: And as promised, I've unsubscribed. There were no worthwhile emails after my last email, either. Just spam of varying degrees of spamness.
This is probably of interest only to the old-timers here. (Ironically, as a cross-post, this is almost by definition spam for LW, since anyone really interested in the topic would already be subscribed to SL4 and would have seen the emails.)
In 13 March, I finally got around to a long outstanding bit of cleanup: suggesting that the equally long defunct SL4 list be formally closed, things tidied up, and the lights turned out. The suggestion met with a mixed (and muted) reception.
Last night I followed up with a second email comparing SL4 activity to activity on Extropy-chat, LW, OB, and MoR; it won't surprise anyone trying to drink from the firehose here that LW is approximately 3 orders of magnitude more active than SL4 is.