The difference is which goes up, GDP or unemployment.

Why not both? That doesn't mean it's necessarily a good thing at extremes.

Lets imagine a fully automated world where 10 billionaires own all the land. For them productivity is pretty much infinity. They push a button and robots make it happen.

But the 6th person that is not part of the owner class is effectively screwed in this world. They don't got no land, and they don't got no robots. They have no means of supporting themselves. The only way they'd survive is by slumming off for scraps of the wealthy.

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This is the question many of us are asking now. As things become more automated, what value are you going to add to require the ruling class to keep you around?

How and who is effected.