How does VR impact agent based modelling techniques? I could be missing something, but real-world simulations seem entirely possible without needing the extra work for visualisation.
Improbable's SpatialOS is not a VR platform in the Oculus-way. Real-time simulations can be (and are) used as the backbone for super-expansive game universes which are visualised using VR graphics engines (or any other technology, really).