If you were 55+ with your only qualification being that you could drive a truck and that niche was automated away, this would absolutely be devastating to you.
That would probably be better. In reality, however, a business will go for the cheaper (or required-by-law) option and will more heavily towards humans or automation
To be honest, if I'm 55+, I'm probably not too worried that self driving trucks without attendant drivers might be permitted on some major trunk routes a few years after my retirement