In the year 1930, John Maynard Keynes predicted that, by century's end, technology would have advanced sufficiently that countries like Great Britain or the United States would have achieved a fifteen-hour work week. [...] The standard line today is that he didn't figure in the massive increase in consumerism. Given the choice between less hours and more toys and pleasures, we've collectively chosen the latter.
—
Bullshit Jobs by David Graeber
(Page xiv - xv)
I don't disagree with Graeber here -- but to say we've (i.e., the working class) collectively chose the latter is a bit on the nose, especially when you look at how the welfare state was being scrutinized and dismantled around the globe in the 70s.
Not to mention the West has been steeping in prosperity theology since at least the 1880s.
What I think Keynes didn't factor in was the rise of movements like Fordism in the 1930s and that CEOs like Henry Ford would become more focused on the capitalist labour process.
But maybe that's much of a muchness at this point?