I agree, but that's actually a good thing. How do you get more than someone else if everything is made for free by machines? New jobs would have to appear that produce handmade expensive goods and services that the rich can use to distinguish themselves from the poor :)
We're living in a lite version of that utopian world today, actually. It's pretty damn cheap to live in Canada or the US if you don't buy anything but food, water, and shelter. You'll find that most of your dollars today are spent on luxurious crap to improve your standing versus other people (new cars, rent in a fashionable urban center, new clothes, etc.)
In many socialist countries welfare is good enough that you can live quite healthy without ever working at all!
But we've always found new things to work on and purchase and we will continue to do so. They'll just be more meaningful than the repetitive crap most people have to do to eke out a living today.
Well, this is a prime example of why our trajectory is not converging to utopia. 'Things' are cheap, yet income inequality is extremely high in the countries. 'Things' will always come at a cost. Those who profit in the absence of labor will be a small subset of the population. The land owners, the farmers, those with political control. Sound familiar?
Welfare may be good enough in socialist democratic countries to live in relative comfort, but that is being subsidized by those who work (and I agree with this strategy). The assumption you are making is that if labor were removed from the equation, these countries would continue to exist as they are. I disagree with this premise.
We have always found new things to work on. But at the same time, jobs have become more monotonous as they are minified. The rate of automation is exponential, which hasn't been seen before. The assumption that we will all move into knowledge work is a poor assumption. Bob the builder wants to use his hands, not his brain. And good on him for being him.
(I believe we reached this point some time ago)
In a post-scarcity world, I don't think the problem of insufficient meaningful work is likely to occur. There will always be a kitten to be played with, art to be made, research to be performed, and more.