As someone who has been in the trades since the age of 16, I'd say that some of the biggest issues is repeatability and prefabrication.
In my subdivision, I'm watching homes being built in 2 months. Carpenters are basically given prefabricated kits to assemble. Homeowners have a limited choice on the construction of their homes. It's taken originality out of the building process and it just seems boring to me.
As a side note, I've talked to one of the general contractors that's been building homes in this area for awhile. He's been telling me that the builders in this area are planning for yet another housing recession that he expects to hit within the next year or so.
Modifications from original plans cost way too much. I suspect a major cause of this is the limited availability of skilled craft workers that are willing to accept the challenge. Ultimately, I'm not sure what the fix is, but I suspect that wages need to increase for the skilled craft worker. But that does nothing to help the housing market.
As a parent, if my children (who are 9 and 5 years old) show limited interest in their education then I will push them into the trades.
It has worked for me. I started out as a mud man for brick layers, moved on to firefighting, then installed industrial remediation systems and now work as a pipeline control technician for a major utility. It took me some years to make the wage that i've wanted, but where I am now I'm able to support my family on my job alone.
I'll be honest, I don't see this trend stopping anytime soon. Not to paint with a large brush, but no one wants to come out of high school and turn wrenches.