It is true that if labor becomes more efficient, workers must find other uses for the time they now have available. But why is this a problem? Human beings have unlimited wants, and there are always new uses for human labor.
"Herein lies the key to changing society — changing public opinion or people's preferences toward government. And the only way people are likely to change their preferences is through education and persuasion; force is ineffective."
Conservatives have often claimed that that the libertarian (aka "classical liberal") alleges "human freedom as the single moral imperative. " But I doubt a single example of this could be found in the whole history of liberalism.