When those jobs are automated, what will the human workers do, will they leave that company? I'd enjoy doing something else if that was my job, but if there was

When those jobs are automated, what will the human workers do, will they leave that company? I'd enjoy doing something else if that was my job, but if there was a more useful job there, wouldn't they already be doing it? This is in summary why I think more automation will lead to some people losing their jobs - if there was a more profitable alternative for a company (more productive, paid as well or better?) then wouldn't the company already have automated it?