PSIM is a siren-song for which many a young career has been wasted, in my opinion. I mean, in its purest form, it's a 2nd-derivative: your market is only those customers who already have installed the underlying systems at great expense. It is hard to convince them that this "layer" on top will fundamentally will be worth the additional cost.
Another fundamental problem with PSIM is that its definition is subjective. Technically, any VMS or PACS is a PSIM. Making a business essentially out of adding missing features to others' systems, is a risky strategy. Just ask hundreds of iPhone app companies.
One thing that MAY make the PSIM market more robust is the requirement for integration of automation and sensors into a dashboard for personnel to see and manipulate signals. LED lighting should also have an effect, as will the desire to see and control anything else with an IP address. A large campus or multiple buildings add to the complexity of operations and maintenance, and add credence to use of a PSIM.