At The Utopian there are details of a project by Adorno and Horkheimer for a new Communist Manifesto:
Horkheimer: Thesis: nowadays we have enough by way of productive forces; it is obvious that we could supply the entire world with goods and could then attempt to abolish work as a necessity for human beings. In this situation it is mankind’s dream that we should do away with both work and war. The only drawback is that the Americans will say that if we do so, we shall arm our enemies. And in fact, there is a kind of dominant stratum in the East compared to which John Foster Dulles is an amiable innocent.
Adorno: We ought to include a section on the objection: what will people do with all their free time?
Horkheimer: In actual fact their free time does them no good because the way they have to do their work does not involve engaging with objects. This means that they are not enriched by their encounter with objects. Because of the lack of true work, the subject shrivels up and in his spare time he is nothing.
h/t Brian Leiter.