Technology is steadily getting advanced enough that many jobs will become obsolete, especially low skilled work, without new alternatives. Given that large swathes of the population will not be able to find work, how do we support these people? Or, do you expect that there will always be enough work for everyone, despite technology?
Sounds like a perfect argument for a welfare state, contraception, and a very targeted immigration policy that liberally lets in the skills we need and constrains the number of people who don't have those skills.
If the poor had far fewer children and we allowed more college and graduate school immigrants into our country things would improve dramatically. Why Republicans are against contraception and abortion I will never understand.