Marx's dream?

From Chris Dillow's Marx's important error :
"...there is this passage in the The German Ideology, written some 30 years before vol III:

In communist society, where nobody has one exclusive sphere of activity but each can become accomplished in any branch he wishes, society regulates the general production and thus makes it possible for me to do one thing today and another tomorrow, to hunt in the morning, fish in the afternoon, rear cattle in the evening, criticise after dinner, just as I have a mind, without ever becoming hunter, fisherman, herdsman or critic.
.....
He was presaging a point made 85 years later by Keynes, in his essay (pdf), Economic Possibilities for our Grandchildren. In this, he predicted - just as Marx did - that productivity would grow sufficiently to allow our needs to be met with very little labour:

For the first time since his creation man will be faced with his real, his permanent problem - how to use his freedom form pressing economic cares, how to occupy the leisure, which science and compound interest will have won for him, to live wisely and agreeably and well.

Marx thought that living wisely and well would consist in working voluntarily, cultivating mind, body and garden.
This, though, raises a question. Why is it that the rise in productivity hasn’t had the effects predicted by Marx and Keynes? Why have our “needs” risen as our productive powers have, with the result that the hours we devote to employment haven’t fallen as much as Marx or Keynes forecast? Why is it that so many of us - I count myself fortunate to be a partial exception - haven’t used wealth to free ourselves from alienating labour?"

There is a suggestion in the podcast linked in the post Jonathan Wolff on Marx on Alienation that the above remark by Marx might have been an isolated statement to tease Engels.