You make good points but both your examples are bad.  Nurses and truck drivers are an expense.  Is there a real shortage or is this a manufactured shortage claimed by business.  Owners of rehab places want their mailbox money.  They don't want it going to pay nurses.  If owners of trucking companies want more drivers they can get them if they pay more. 

The owning class says people don't want to work.  The truth is they don't want to pay.  Licenses are required to be a nurse or to drive a truck.  That shrinks the labor pool.  Business wants a larger labor pool so they can hire cheap workers.

For the highly skilled, those with skills you can't pick up on You Tube, immigration will fill a shortage be it real or imagined.  Wages will be kept low.  The H1-B program of sanitized immigration has been around for years.

It comes back to the money.  Who finances the green revolution?

Nurses mostly came from the Philippines ten years ago.  What changed?

* Living facilities for guest workers build themselves.  Workers get paid enough to pay rent.  The amount of money Microsoft millionaires (people paid in stock years ago) have invested in new apartment buildings in Bellevue and Redmond, WA must be in the hundreds of millions.  The workers have to live somewhere and it is not hard to figure out what will be profitable with a little inside info.

The superorganism grows.  Money is its blood.