It’ll never get funded, never pass the regulatory process, be tied up in court by the Sierra Club for years ...
And, since the only way it could get built for great distances would be above ground [underground not economically feasible], every whackjob would be taking pock shots at it with their guns.
One leak to break the vacuum - and it comes to a stop ...
It’s not supposed to have a vacuum. It will use fans to distribute the air pressure, so it behaves like it’s in a vacuum without it being in one.
So what happens to the people when their transport cube thing when IT Oops....messy cleanup.