Of course 9 billion people won’t be able to enjoy exactly the same standard of living that the rich enjoy today, just like the middle class of today doesn’t enjoy exactly the same standard of living that feudal aristocrats used to enjoy. Today’s middle class don’t have vast estates, they don’t get to administer low justice, they can’t make war upon their neighbors with impunity, they can’t have peasants who insult them murdered, they can’t grab beautiful women off the streets for their private use, they don’t have giant staffs of servants or slaves to care for their bodily needs. Of course it would be impossible for the majority of people to have those things, since they depend on other human beings to provide those services.
However, today’s middle class in many ways has a vastly superior standard of living compared to that feudal aristocrat. Our meals aren’t provided for us by an army of peasants and cooked by servants, but it is available cheaply and conviniently at any supermarket or restaurant. We aren’t free to use violence whenever we like, but we are also largely free of the threat of violence from others. We can’t force women into sexual slavery or concubinage, but pornography is widely available. We don’t have vast estates, but we can travel the world safely and conveniently, and public spaces are numerous. We don’t have servants to wash the dishes or our clothes or clean our houses, but we have machines that allow us to do the cleaning ourselves easily. We don’t have private court jesters, musicians and entertainments, but we have the whole panoply of the modern entertainment industry. And of course, there are many things that were completely unavailable to the ancient aristocrats that we take for granted…medical care, communications, the rule of law, and on and on.
So while the poor of tomorrow might not enjoy the same things that the rich do today…several cars, a big house with staff to clean it, etc, there’s no reason they couldn’t enjoy the comforts that the rich enjoy but delivered in different ways. Private cars for everyone is unrealistic, but in Europe and Japan today it is perfectly possible to enjoy an upper-middle class lifestyle without owning a car. People take trains, or taxis, or busses, or fly, or when needed rent or hire a car. There’s no need for 9 billion luxury internal combustion private vehicles. What people want is to be able to get where they want to go quickly and conveniently. Nine billion suburban homes with 10 acre grounds might not be possible, but luxurious high rise appartments certainly are. Nine billion daily newspapers printed on wood pulp might be inefficient, but why do newspapers have to be printed on wood pulp? Nine billion washing machines are certainly possible, but so are clothes that shrug off dirt more easily. And there’s no reason that those nine billion people couldn’t enjoy the latest fashionable designer clothes, since those designer clothes don’t actually take more resources to produce than cheap knock-offs. People need packaging for all the food and consumer goods they buy, but we can rationalize and dematerialize all this, and recycle the stuff we do use more efficiently, to where it costs less to recycle a good than to throw it away. All those people will need teachers, journalists, scientists, engineers, health care workers, entertainers, cops, lawyers, counselors, xxxxxers, yyyyyers and zzzzzzers, who will provide those services? Of course those new entries into what we consider “the rich” will provide those services for each other. And there will be whole new classes of goods and services that we are only beginning to enjoy that people in the future will consider neccesary luxuries. They won’t be just consuming goods and services, they’ll be providing goods and services.
Think of all the kids today who could grow up to be brilliant scientists, or artists, or all sorts of things, who are actually going to end up as subsistence farmers, sweatshop workers, or street people in some third world slum. What if they could actually lead productive creative lives?
Of course, we’ll still have the mega-rich, we’ll still have poor people, even 100 years from now I imagine there will still be places on earth where the lifestyle would be recognizable to a serf from the middle ages. But more and more those places will exist on a semi-voluntary basis, because what it takes to become a rich country will become more and more obvious, and people who wish can leave those places to become part of the global society. And there will still be people complaining that the poor don’t have access to nano-immortality, or can’t own their own asteroid palaces, or whatever the fashion of the mega-rich will be in 100 years. Perhaps the fashion will be for hand-crafted goods that are unreproducable by industry, not everyone will be able to afford homespun cotton grown on their own farm, woven on a hand-loom and stitched together with needle and thread. Anything that requires human attention or effort will be expensive, anything that can be automated will be cheap and regarded as inferior, regardless of whether it is superior to what 99.99% of humanity has had to struggle with over the millenia.
And of course, not everyone will get that little social thrill of being richer and more powerfull than other people. Most rich people today don’t try to make money because they want more comfortable clothes or better food or a less-lumpy matress. They want expensive goods, not because those goods are better, but precisely because they are expensive, and show that the person who owns them is the sort of person who can afford to spend money on luxury goods. Material wealth beyond the wildest dreams of today’s middle class Americans won’t stamp out that human impulse.