A couple of metrics that noone ever mentions and yet I believe are indispensable gauges to to the health and vitality of Opensim as a whole are a) the populations and chatter of the Opensim-dev, Opensim and to a lesser degree the Osgrid Irc channels. And b) the amount of new revisions put out monthly of Opensim Master code. The populations of the irc channels are dropping and the chatter has subsided to occasional unanswered pings and questions. This to me says a lot about the long term prospects of Opensim as much as I hate to point that out.
Though I have not tried to determine the rate of revisions to Master code month to month, I suspect that it has dropped significantly also. Hopefully just temporary blips.