Didn't Vint Cerf already come up with an interplanetary internet? Oh yes: http://www.wired.com/2013/05/vint-cerf-interplanetary-internet/
Musk is complete nerd-bait garbage. If you look at all of Musk's ideas, they're an average geek's wet dream: rockets, electric cars, solar panels, and now this. Just very unoriginal & obvious ideas.
If he really had talent, he'd come up with ORIGINAL ideas, the kind that surprises people, instead of the obvious ideas that are expected of nerds.
His opposite would be someone like Steve Jobs, who actually had an intrinsic talent, and was able to come up with the basic ideas that changed society. Back in the 70's absolutely no one thought computers would be anything more than industrial appliances. Jobs was the ONE guy that thought it would be possible for kids and grandmothers to use computers at home. And of course he comes up this, as well as all these ideas in NeXT, Pixar, and the resurgent Apple. (Does anyone remember smartphones before the iPhone? lol) You can trace the growth of the US economy over the last 40 years to literally that one guy, and the world actually changed because of guys like him.
Meanwhile, geeks like Musk and his fan girls work on the most obvious, uncreative, and boring ideas, the kind of ideas that have been written about all the time, but no one wants to do because they're actually bad ideas (HyperLoop, which is a bad idea compared to high-speed rail), or have been successfully implemented before. None of his Space-X work is anything more creative than what NASA and contractors already did 40 years ago. And did you know electric cars were more popular than gasoline cars in the late 19th/early 20th century?
All his ideas are truly boring. It is only millennial nerds that have no sense of history that find him appealing, because they never heard of the awesome stuff people already did. You guys would go crazy if you saw the amazing ideas NASA was throwing around in the 70's. The Space Shuttle, which was an amazing achievement in itself, was just the start.
The other problem is that geeks generally latch onto upper-crust ideas like these, but the real geniuses are the ones that come up with FUNDAMENTAL ideas that changes the very nature of life itself. Things like Einstein's Theory of Relativity, Vint Cerf's IP protocol, Steve Job's vision of the personal computer, and so on. It's like taking the red pill in the Matrix. THOSE are the ideas that we should be pushing for.
You can always tell who has a fundamental misunderstanding of talent and creativity when they think Elon Musk has any.
The kind of people we should look up to are the ones that are more basic than that - the kind that knew that the real problem with portable music players was the actual knob used to operate it. So basic, yet so brilliant.
Given all this, Musk is a hard worker and a great low-level implementor, but he isn't the hero that everyone think's he is.