System Dynamics is no longer new, but its impact on the wider world is still quite immature.  Newer technologies have been taken up much faster and more broadly, bringing about huge societal changes.   Is System Dynamics fundamentally different, and do essential characteristics necessarily restrict it to narrower impacts and a slower rate of diffusion?  The answers lie in innovation.  This paper describes how innovation by practitioners will profoundly change the practice of System Dynamics and its societal impact.