I read this book [1] back in the '90's. An amazing read about the world of auto manufacturing.
Regarding Tesla, surely I am not the only one waiting for competition. I think the problem Tesla has is that when the giants awake they will outclass them at nearly every level.
It's like thinking you are doing great in your open water swim until the triathletes leave you in their wake. Surely companies who have been honing their skills and optimizing their design, engineering, manufacturing, distribution and support over decades will have non-trivial advantages over Tesla.
The way I see it, building an electric car is significantly simpler than one with an internal combustion engine. All you have to do to see this is take an accounting of the thousands of parts and many fluids you leave out. The design, manufacturing, supply chain, distribution and service costs of having another 1,000 to 2,000 parts in a car are monumental. Any company that knows how to deliver quality, reliable and reasonably priced internal combustion cars will have a laugh delivering electrics at scale.
They know how to do this today. They are all waiting for the same thing: Cheaper, lighter, better energy storage. Recent developments might indicate this could be just a few years out.
Tesla has a problem: It has to achieve scale before that moment in time. Today choices are few and Tesla might have an advantage with Model 3 (if it ships on time and has no problems). In some respects they are the only game in town (range). The minute that changes people are going to flock to other manufacturers.
[1] https://goo.gl/Drhc1Z