Human work is going to cost more in the future, and immigration from countries such as Thailand or Vietnam is already slowing down. Even a mediocre robot will be sought after if it is the only choice you have.
I think we could increase birth rates by making a taxation scheme in which the most marginally effective way to solve a problem is with a human, paid a wage which allows for that occupation to be a lifelong career.
Humans that are chronically unskilled also don't learn well, somewhat as a rule.
Humans that don't make much money have a high turnover rate from burnout. Additionally, those that can learn typically leave for greener pastures.
The bar isn't terribly high. Efficiency of scale in production will solve this eventually. I think the likely outcome is robots building themselves first.
In the case where they’re replacing a low-skill human worker, they’ll pay for themselves in 1-2 years…plus no sick days, no drug use, no theft, and they can work 24 hours a day, less any recharging time.