doctors save lives, firemen make our homes safe, astronauts explore the outer space etc...
bitcoins do nothing except pushing numbers around to make the early adaptors rich.
And you think there would be doctors and firemen without money? There wouldn't because being able to do price comparisons in a universal medium of exchange is very beneficial to transmitting information in the market, which is the cause of signals telling people that they can actually make a decent living from being doctors and firemen.
Government money is constantly manipulated which means that it does a very poor job of transmitting information, which is why we have recessions and in almost every area either too few or too many doctors and firemen and resources are being wasted. Bitcoin will do a much better job at this if it becomes universal thus providing enormous benefit to mankind.
As for astronauts I don't think it makes any kind of economic or entrepreneurial sense to send people into deep space at this stage. Researching colonization and sending people into low orbit for satellite maintinence and tourism maybe. But the space shuttle is a fucking disaster in waste of resources at something barley ever worked and the entire space program is just a government circus.