And 200 years ago, not everyone had the ability, skill, or desire to move to the city and just jump into manufacturing. 50 years ago not everyone had the ability, skill, or desire to just jump into operating the new electronic machines.
Skill? Most manufacturing jobs were deliberately reduced to easily repeatable steps that an average below high school educated person could accomplish. Just the sort of jobs to fit hordes of ill educated farmhands. Hardly the same as expecting someone to jump from a repetitive GED level job into college level computer engineering skill.
That's quite the point. When people no longer had to pick the cotton (making raw cotton less expensive), they could instead work making things with the cotton, a higher paying job. When the looms were automated (making textile products less expensive), people moved again to higher paying jobs. As the factories were automated, even less skilled people moved into office jobs - data entry, secretaries, customer service, etc. As secretarial, data entry, etc. was automated (making data-centered tasks less expensive), the entire information economy was created.
"Some" people moved up. The majority have shifted into whatever part-time McJob they can find to try to make ends meet.