In the April, 1968 issue of Wireless World, there is a short article titled “P.C.M. Copes with Everything”

It’s interesting reading the 57-year old predictions in here. One has proven to be not-quite-correct:

While 2⁷ levels are quite adequate for telephonic speech,
2¹¹ or 2¹² need to be used for high quality music.

I doubt that anyone today would be convinced that 11- or 12-bit PCM would deserve the classification of “high quality”. Although some of my earliest digital recordings were made on a Sony PCM 2500 DAT machine, with an ADC that was only reliable down to about 12 or 13 bits, I wouldn’t try to pass those off as “high quality” recordings.

But, towards the end of the article, it says:

The closing talk was given by A. H. Reeves, the inventor of p.c.m. Letting his imagination take over, he spoke of a world in the not too distant future where communication links will permit people to carry out many jobs from the comfort of their homes, conferences using closed-circuit television etc. For this, he said, reliable links capable of bit rates of the order of 10⁹ or 10¹⁰ bits will be required. Light is the most probable answer.

Impressive that, in 1968, Reeves predicted fibre optic connections to our houses and the ability to sit at home on Teams meetings (or Facetime or Zoom or Skype, or whatever…)