It seems crazy, but there's also some appeal in the idea of opting out of all the legacy infrastructure. If we could rebuild our roads from scratch today to serve a vehicle for the 21st century, what would we build? Probably something like this - standardized vehicles on automated roadways with built in electric connections that enable unlimited long-distance high-speed travel (though we'd just build this into cars i…
If Elon Musk wants to spend--or convince others to spend--billions of dollars innovating tunneling construction, then I'll enthusiastically support whatever vision motivates him.
It's like if a kid decides to clean his room so the aliens can land their spacecraft, then by all means, let's get ready for the aliens!