And why this should be a big idea instead of a stupid one? All the passengers that they plan to transport in a day (and even more) are moved in a minute by two

And why this should be a big idea instead of a stupid one? All the passengers that they plan to transport in a day (and even more) are moved in a minute by two Crossrail trains. I can’t really see the advantage of taking 1440x the time to move the same amount of people...