Fun indicator - personally I'm checking here once a day maybe three days a week instead of multiple times every day. The last time I was at that point was during the summer of 2013, which was also super boring.
Then we'll know we're at the bottom when bitcointalk only gets 5 posts a day.
I'm intrigued by this predicted desolation. Even down in the doldrums there'll always be new folks arriving and asking questions and you can always depend on trolls to keep the volume up.