Your job is what you make out of it. Some people enjoy retail (I can't imagine who, but okay). Some people are people friendly. Other than fast food and restaurants, retail customers are probably the worst type of customers, but its not hell. You just take a bunch of crap. All jobs have situations where you take alot of crap. I can only see it as depressing if you plan on doing nothing better with your life. Its depressing (and hellish) if you don't enjoy your work. Even if you're not making that much money, you'll have some reasonable degree of tolerance for your job if there is something to look forward to.
In theory, anyone can try to learn the constant gyrations of the market, but that takes time and the learning curve is steep.
Not to say that people working these jobs will suddenly become unemployed, but these jobs will become rather difficult to come by. For example, the fact that I have to wait in a long line at the concession stand during an afterwork flick when there two cashiers and the booth has enough to man five cashiers.
“If we must have an enemy at the head of Government, let it be one whom we can oppose, and for whom we are not responsible, who will not involve our party in the disgrace of his foolish and bad measures.”
- Alexander Hamilton. Spiritual father of #NeverTrump