I don't think the change is coming quickly, actually. I think truck drivers have a good 10 years before they're out of a job, both due to technology (self-driving cars won't be fully autonomous for at least 5 years), and due to regulation/adoption (add another 5+ years). This actually leaves them less of an excuse to start retraining now, but it's also a problem because it gives most of them an excuse to dismiss the tech.