For a job, an income, isn’t in fact what any of us humans want. What we want is the ability to consume (consume houses, food, clothes, cars etc, all of which are now being made by machine recall) and and income and or a job are only methods of achieving that. So, if the machines are doing all of the work then, well, who is going to be consuming the output? As there’s only us human beings to do so I pretty much guess that it will be us human beings consuming all of the output. And if we’re able to consume all of this output being produced by the machines then why would we care about having a job or an income? We get to consume without either, don’t we?
All of our material needs are being fulfilled by the machines. We are thus able to be:A farmer in the morning, a laborer in the afternoon, and a philosopher in the evening.
We’re able to be communists in short. Potter around growing a tomato or two in the morning (nothing quite like it for the spirit, to actually nurture and grow a plant then eat the produce), labour a little in the afternoon at that tennis backhand or lay the crazy paving (yes, the machine could and would do it better and faster but the spiritual rewards of hand work are, as we are told, considerable) and in the evening we can yammer with our friends over silliness (that is what philosophers do, yes, yammer with friends over sillinesses?).
A world in which the machines made everything would be a world in which there was no shortage of anything and in such a world what on earth would any of us actually desire a job for?
Of course, for anyone who has ever read any of Ian M Banks' Culture novels, this whole scenario will be entirely familiar.
The Culture is characterized by being a post-scarcity society (meaning that its advanced technologies provide practically limitless material wealth and comforts for everyone for free, having all but abolished the concept of possessions), by having overcome almost all physical constraints on life (including disease and death) and by being an almost totally egalitarian, stable society without the use of any form of force or compulsion, except where necessary to protect others.
And, indeed, it seems to be a rather desirable way in which to live. Although, having said that, most of The Culture novels are about how that society spends its time interfering in less developed societies...