The majority of societies biggest challenges are deeply connected and complex. Even in our own lives the hurdles we encounter rarely stand in isolation. And so it is with ecosystems, what might be at the hart of one, might be fringe yet relevant to another. Considering ecosystems aren't closed but open, momentum of one system can spark that of a new.
The diversity of perspectives on a topic leave ample room for new, better, evolved insights and experience to be shared on a topic. With growing momentum ecosystems have a habit of iinviting new people in, because they have something to contribute and/or because the are keen to explore new frontiers.