> Relatively low margin, fragmented service jobs. Waiters/waitresses, fitness instructors, barbers etc. Those jobs are often still better than the jobs being automated away (truck driving)

No, they aren't. Many "low-margin, framented service jobs" of the type you list are often effectively sub-minimum wage (possible because they are usually independent sole proprietorships renting facilities from the entity that looks like their "employer") highly-saturated already, increasing the proportion of the population trying to work them will further crash wages.