The problem is that company funded training is dead. There are some leftover countries like Germany that do formal apprenticeships with reduced pay and they tend to have lower youth unemployment but they are the exception. I know some people who just did an apprenticeship in their 30s and got a new job that way.

The alternative would be to have a government mandated long term unemployment insurance program that funds education. It would be a general solution to career loss of any kind. I personally dislike that coal worker communities are being protected by the government. If there was an effective program that helped these people get better jobs we wouldn't even have to worry about protectionism.

The big unsolved problem is people who are 10 years away from retirement. They can't just spend 3-5 years retraining without delaying their retirement.