It's the same reason that the venerable central working place and water cooler will not expire either, despite the home office.
Human contact is an essential part of successful business or entertainment.
Studying your favorite subject or pursuing your favorite hobby alone is rewarding, but a good joke and a clever business deal are heightened and inspired by real, physical group presence. Then there's commercials. ITV can eliminate them, if you want - assuming they're less interesting than the content, not always the case with, for instance, the SuperBowl. Swann's conclusion is that ad makers will be forced to come up with more ads you'd like to see or are more genuinely informative. But there are other, sneakier alternatives.