The article you linked about Bosch is interesting. Again, reading between the lines on that article, it sounds like the problem is in Bosch's software, not VW's.

To me, it reads a lot like the old video card driver issue. You know, when you've got a bug in your ATI video card driver, and you run the ATI reference drivers instead of the computer manufacturer's drivers because the reference drivers fix a particular crashing bug. ATI always tells you to use the manufacturer drivers, but you've found that the reference drivers work better with fewer bugs, because they're newer. Sounds like VW was just shipping the Bosch reference drivers, as it were.

I'm still not yet convinced there was any deliberate programming effort to falsify emissions tests. I think the news articles are failing to grasp the complexity and the potential for bugs here.