Toyota used to be so revolutionary. LS400, Prius, Supra, etc. That's what makes things like this so hard to swallow. They still have that legendary reliability, which goes a long way.
Big companies tend to become more conservative, not necessarily by design or intent (but often as design/intent). I'd venture Toyota's internal business model of today is more about protecting their market share than growth, whether they would tell themselves that or not... They'll never admit that to the outside world, nor would any company.
I don't work in the auto industry, but I do work in an industry that has parallels, and have experienced this effect of inverse relationship of size to innovation. Risk vs reward sort of stuff. Not saying its correct by any means, but that I can see parallels in regards to this discussion to the industry I am employed.
Also, a company like Toyota (or basically any publicly traded company) is more concerned with what wall street thinks (ie stock prices) than their customers; that stock price has more direct influence than actual sales/margins. I won't say anymore regarding this as it may steer the thread into the cave...