Retraining is part of the answer. For professional jobs (in the classic sense) continuous training is a core tenant of remaining current in the field and if applicable maintaining licensure. The faster technology moves, the more everyone should be thinking about how careers will be in a constant state a flux. Not just retraining from a factory job to some service job, but every few years basically having a role that has morphed into something new. We need institutions, practices, and norms that reflect the new normal of high-technical change.
Many historical blue-collar jobs that have been automated (or even things like farming before it) were much higher-skill than most people give credit for. It is just that the training and general knowledge available to perform well were more ambiently available. An example today is working with standard business software. You don't get trained in office and excel, you get trained on how they are used in the company's specific workflows. Companies also had more on the job training and apprenticeships.
So I also don't know what do with the wave of truckers that will be automated away with self-driving big-rigs (presuming that happens) but I think the future is one where we don't actually have as many folks dedicated to one line-of-work where such a jarring transition is necessary. Or perhaps the corollary, that we should aim for that more dynamic approach to prevent further disruption of big discontinuities