The whole 'Man (Woman) is Space' idea is a waste of money until we have cheaper means of getting into Earth orbit. All kinds of mumbo jumbo are employed to make the manned exploration of space seem necessary but the fact is unmanned spacecraft have already completed a fairly decent exploration of the ENTIRE solar system. Human beings have been to Earth orbit and the Moon and that is it.
Want some examples? Saturn and one of its moons (Titan) are being explored right now by unmanned spacecraft. Now that spacecraft was very expensive and it is unlikely there will be missions like that again. Some fairly cheap unmanned missions could complete our preliminary exploration of the solar system.
Even without any such new missions we have already achieved a reasonably decent early exploration of the solar system.
Unmanned spacecraft can achieve almost everything we need to achieve in space-exploration, communications, weather forecasting, Earth observation, navigation, etc. For safety we need to develop techniques of intercepting and impacting asteroids and comets which could endanger the Earth.
An inflatable space telescope bigger then Hubble could probably be developed and sent into space using an expendable rocket.
I want to explore space as much as anybody and I was interested in the space program from the start. But until we have some safe, efficient, and low cost method of getting into Earth orbit, we can not really even begin the true exploration of space by human beings. Our machines have already been where we would like to go.