Seems like the focus should be on lowering the cost and increasing accessibility of retraining programs. When it's nearly free and available to anybody in need, motivated individuals will take care of themselves, and you just need to take care of smaller remnant group and address their specific issues.
Conceivably, someone who held employment in a disrupted profession for 10 years could qualify.
Alternately, retraining could be open to anyone who comes in, if not too many people come in practice there is no need to keep the doors closed.
Like I said, I don't have a good answer.