Next government can facilitate the exploration of space. It's axiomatic that before space can serve as a catalyst for economic development, it has to be thoroughly explored. Next government can serve as a kind of core market for products and services ranging from commercial launch vehicles to space solar power stations. A guaranteed, though competitive, market can help to facilitate of the technology required to open the space frontier to and widest range of human activity. Finally government can do what government does best and indeed what government was originally designed to do.
Government can bring the rule of law to the high frontier of space.
The private economic development of space cannot happen unless there is some entity which guarantees property rights, settles disputes between private parties, and establishes an orderly environment without which not only commerce cannot happen, but life itself would be impossible. The current NASA does some of these things, like technology development, poorly and others not at all. NASA does not even contemplate being the facilitator of private, economic development of space. NASA's vision for space consists of small, expensive facilities like the space station, staffed by highly paid, highly trained government employees. This vision stretches out into the indefinite future.