A lot of this is due to outsourcing...
There was a time when auto companies make their own parts or at least most of them.
The wood in a Model A came from a Ford forest was transported on Ford rail cars to a Ford ship and then fabricated in a Ford shop for installation on the Ford assembly line... same for iron ore and vanadium steel... Ford made the wheels, transmission, differential, axles etc...
I run into this on a daily basis with medical equipment... today I have a very expensive Nitrous Oxide Hospital gas manifold system and the parts I checked on are no longer made... was told I could have the sales staff quote me for replacement... same with the fluoro scans that use CRT monitors... simply no only made... just like control pendants for 40k OR tables or Patient Monitors that cost 10k a pop...
From a different industry, but the old phrase "We hire contractors, so that we have somebody to blame things on", comes to mind.
One characteristic I find common with my close friends is that they are accountable for their actions.
I find it harder to short-list companies who pass the same test.
Many of those companies would argue that they are accountable in only one respect - To Wall Street. That is one reason that privately owned companies get my attention - unfortunately, the few that make cars are way outside my snack bracket....
Companies can hide behind legal position statements ("Our (now bankrupt, because they were stupid enough to do business with us) supplier screwed that up" or "Naahhh, that was the Evil Captain Kirk talking, don't pay any attention" (oblique SNL reference))..... those, and $2, will get you a cup of coffee.
I started this thread thinking about 10 year time frames..... I'm now coming to think that Part Lifecycle surveys across this industry may turn up interesting results at not much more than 5 years !
(Another one.... recent Avalanche (est. 2010) sitting at my buddy's shop.... no replacement fuel pumps are being made yet, as it's too new. It's now starting to look like with some vehicles, once you subtract the time that it's Too New, from the point where it is Too Old, there aren't that many months that replacement parts are available !).
Rgds, D.