It won’t happen and here’s why (my opinion)
Too costly to build. He underestimates the true cost
Overselling the capabilities. It won’t go that fast, you won’t be able to get from point A to Point B that quickly.
Because it won’t live up to the hype, there will not be sustainable use to make it profitable.
It will take up a LOT more land than he is suggesting.
Too dangerous. Very little needs to go wrong at those speeds to have catastrophic deadly consequences.
It will be under repairs for a large part of the time, shutting down the whole system. One stuck car, means the whole tube is backed up behind it. This will happen often.
Basically, not enough need, interest (cash flow coming in) to justify the cost of researching, constructing and building.