Well, "sweet spot" is probably a little bit on the subjective side, but I don't think we'd get much argument that the EL isn't used as much as it used to be, and that people who apparently met on this site and became writers of (at least) one book by Wrox (or was it Wiley?) moved on to some sort of fame & fortune (OK, OK, probably not much fortune in it).
And social groups always change ... I note that there are some smart, personable personalities that are posting here frequently, have moved up in the "standings" (like that's something meaningful, but, hey, why tax the database for $count if no one cares, right?) and I'd really like to tip my hat to.
So, there's plenty of subjective stuff to analyze 🙂