If you look into what the "Mondragón route" is, you'll understand the differences to the current system.
To sum it up, Mondragón is a federation of worker owned/controlled enterprises/cooperatives. Due to this innovative ownership model democracy is intertwined in all decisions in the companies. Therefore, Jim (workers) gets a real say on how automation is leveraged.
About the possible career change. Mondragón handles it quite gracefully in my opinion. They have internal recruitment that attempts to relocate "obsolete" workers to other parts of the federation, as to avoid severing work relations entirely. They also invested early on in internal capacity to teach themselves through their technical schools. This way the profit of the automation is paying for the education of the workers it replaced.
To everyone who will react to this with "good, the planet is fucked, don't bring more people into this mess" I sympathise with your reasoning and I would suggest you consider adoption to help those already brought into the mess. To those who wish to have kids of their own, consider it too!
That's all, have a nice day.