If we had eight-hour workdays a century ago, we wouldn't have been able to support the standard of living expected a century ago. I'm not sure we could have even supported living. The same applies to full unemployment. We may someday reach a point where we are productive enough that we can accomplish all we need when we just do it for fun, but if we try that now, we'll all starve.
So, accepting the premise that the ability to support "full unemployment" (aka, people working for reasons other than money) is something that increases over time, and it can't be supported until the point is reached where it can be supported... how would we recognize when that point has been reached?
Here's the new thread for posting quotes, with the usual rules: