The chart from Labor Department shows that there is a approx. 24% expected increase in demand for Electricians. Similar increases are expected for some other professions also. This looks like a great profit making opportunity for private vocational schools.
It also notes that large American companies have cut back on the apprentice programs, which were very useful in training workers and instead opted for outsourcing. Perhaps, one way to increase apprentice programs it allow US companies to recover the cost of training (net benefit to the workers) from their future earnings (even if they change the job).
Also, EconoPundit asks whether Unions are doing anything to help train workers for the jobs as most of the above trades are in heavily unionized.