I've not been around for a while, but activity seems very low. Is there a point at which Stackexchange will archive the site, making it read only or are our hosts content to let us sit here and tick over?
(Making comment an answer)
I can't answer this fully since I don't work for SE, but according to our stats we are still getting quite a few questions and visits every day. The site is no where near the bad performance of some of the other SEs... one example I can think of is french: http://french.stackexchange.com/ and you can see how we compare to other SEs: http://stackexchange.com/sites#
We get a lot of hits from searches and people wanting to ask questions.... if we have any problems, it's with having people around to answer all of these questions (some which are difficult, rare, or specific problems).