The statement is taken from a book that contains the predictions of a French scientific committee and it’s serious.
Baby boomers will not live on bridges, but their children might. At least according to the book Les 50 innovations qui vont bouleverser notre vie d’ici 2050 (The 50 innovations that will change our life by 2050).
It won’t be the first time in history. Building on bridges was common practice in the Middle Ages and the Renaissance. Take the Rialto Bridge in Venice and the Ponte Vecchio in Florence. But they are small bridges, or giant walkways, depending on how you look at it.