It's a good start, but they'll still need hops and barley.
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The technology which will be required to put up a moon base, and then a Mars base will provide a wide array of technology spin-offs which will be of enormous benefit on Earth. For example, a moon base would need to have a tightly controlled system for recycling air and water for very extended periods of time. This could help in developing the tech needed for making high efficiency Earth-based water filtration and recovery systems. That's just one example, and I'm sure there will be many others we can't even conceive of yet, as more challenges crop up and are met. Recall that when the laser was invented 50-odd years ago nobody had any idea what it would be useful for. It was dubbed "an answer in search of questions." Finding dual uses for new tech is an ongoing activity with enormous societal benefits.

In addition, the cool factor of space exploration will pull promising students into the hard sciences and engineering fields, providing society with highly trained individuals whose impact gradually permeates society at large.

Finally, the more we focus on off-Earth activities, the more people realize there is more that unites us than what separates us, improving relations on Earth.
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we need proof to believe
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