[xchaotic]

But as things get automated and cheaper that’s actually negative gdp growth. So it won’t pay your retirement

[chii]

If things get cheaper, you can live off less income from your investments .

[marvin]

Yep, and in such a world, a reasonable level of taxation would eventually be able to pay for a modest lifestyle for everyone who wanted it.

In a world of such dramatic surplus, it's either that or violent revolution, so I'm fairly sure it would sort itself out.