My only disagreement with you is that I'm happy for a bad business to exist as long as it can manage it. I just don't think we should save them from being destroyed by their dysfunction.
What we have right now is moderate unemployment, static wages, and an industry insisting they can't find employees. If we accept the article's premise that it's not about irreducible skill shortages (i.e. skills are available, or on-job training is an option) then something is badly wrong with that gap.
There's a known pattern where an industry yells about how they can't find employees until some external force solves the problem for them: usually rising unemployment or government-funded training initiatives and subsidies. This is especially rewarding if people get educated/trained into your industry specifically, and therefore can't easily change careers and get value from their labor. Basically you keep wages low and beat your breast until someone hands you a captive labor force.
So one possible explanation for this 'gap' is that employers are keeping wages sticky in the hope that someone else will come and save them from raising wages.
You can also blame the Government. The reason manufacturing wages are so low is because the few manufacturing companies left in the US can't compete with foreign manufacturing. It's hard to compete against companies that do manufacturing in countries with few to no labor laws. Tariffs on raw materials coming into the country are surprisingly high while tariffs on completed goods are low. That situation needs to be reversed if we ever want to increase the wages of factory workers.
Do we have new and more efficient ways to handle industrial waste?
Have we improved our transportation infrastructure so that raw materials can move more cheaply than in past decades?
Has government found less expensive and more fair ways to manage worker injuries and grievances (aside from lawsuits)? Has government reformed health care so that workers can take these manufacturing jobs without fear of being financially overwhelmed by medical bills should they be injured?
Are there tax or other incentives to create clusters of related manufacturing businesses in close proximity to one another?
Are their cleverly designed policies/regulations that US governments can use to legally (as far as the WTO is concerned) favor local industry?
I don't see this sort of reform happening in any significant way (except maybe Obamacare, which requires a lot of government subsidies in the form tax credits).
Where is the actual industrial policy innovation and reform in this country?