It depends on whether your vision of a hub is a single place. I think, by its nature, a hub is a distributed set of networks. It could be a district. It could be a series of connected spaces across multiple districts. In that instance, if the vision of the hub is broader, I do think you need to have a public–private sector model to make a go of these things.
However, it is important to have a kind of anchor tenant facility in the hub who adheres to a set of not-for-profit values. You really want to make sure there are spaces that are more inclusive and more diverse and can take on some of the services that perhaps aren't as attractive to commercial enterprises.