The benefit of this multi-streaming is that it saves significant bandwidth and client processing power.
IMHO, there is no guarantee of significant bandwidth savings.
If the camera and corporate networks are separate, then the camera-side network usage will always increase with multi-streaming, and the corporate side usage will typically decrease.
If they are converged, net traffic could be significantly reduced, but also could increase depending on the usage patterns.
For instance, taking a 16-camera system and enabling all secondary streams when only a few of the cameras are actually being viewed for a limited number of hours a day, might increase bandwidth overall.
It would depend on the viewing usage and the size of the secondary streams.