Mine -- If everything else stays the same, then yes, I think OpenSim is slowly attracting organizations that don't need to be part of a larger community, or groups that bring their own communities with them. And, at a certain point, this will hit an inflection point, where the cost and ease of setting up a new grid will combine with the viral effect of people bringing in their friends and colleagues, and OpenSim's growth will accelerate.
HOWEVER. Things aren't staying the same. All the activity on VR front -- the Oculus Rift, the Virtuix Omni, the game designers hopping on board, the Unity 3D support -- those are all disruptive innovations. They could cause one of the following to happen:
1. An existing platform will find new life with the Oculus Rift. This could be Second Life. Or it could be Unity 3D, or Open Wonderland or There.com or Cloud Party or some other platform that is particularly appealing for some reason for people using the Oculus Rift. Maybe a killer app comes out for it, or a major celebrity jumps on board.
2. One of the big players can notice the opportunity to build the OS for the future, and create a 3D platform. This could be Microsoft, or Apple, or Google. And they'd force their platform onto all their channel partners.
3. Something brand new can come out of left field from some so-far unknown academic or basement-dweller that catches on instead.