I don't know if a universal "BASIC" income is something that will make people happy if that person can only afford the -basics-. There was a study done a few years ago that claimed happiness increased in tandem with salary up until ~$80,000(depends on where you live). Then anything above $80k saw a negligible increase in happiness. This article states that many people feel that their job is pointless and doesnt really contribute any great benefit to society. These people are therefore working only for the money, which, the article claims they may not need otherwise.

I think many people who already work menial jobs that are threatened by automation lack a certain drive for self-improvment that would need to be a required aspect of their lives if they otherwise have an extra 25-30 hours a week. Would these menial workers improve other aspects of their lives or simply watch more Netflix? I think anti-depressant use in a 15-hour\UBI world will increase.