Re: major companies not shutting down. Negatory. This happens all the time. Yes there are fixed costs that you have to eat when you shut down, but if the losses are greater if you continue to operate, guess what?
For example, Louisian Pacific, based in Portland OR just announced today that they will have a rolling 45 day shut down for at least 8 of their OSB panel mills. Of course, they will be conducting scheduled maintenance, equipment upgrades and the like, but that is scant comfort when you are a line grunt who has already used up the alloted vacation days.
In the case of OSB, and I-Joist, I believe that there is a substantial overcapacity in production. Everyone scurried onto the OSB and I-joist bandwagon (for good reason), and now the market is saturated, depressing prices and eliminating profits.
Plants definitely do shut down, reconfigure, or otherwise radically shift their production strategy. If they don't they vanish pretty quick.
The mill I worked for went from three 10 hour shifts on it's layup area to four 8 hours, increasing utilization. Market went down, and they reduced capacity again back to 3 10s.
Unless you have family contacts with management, or unless you just love wood products, I would strongly recommend anyone against a career in forest products.
Frankly, there is blood in the water here.