I think you hit the nail on the head Julian, excellent analysis. We are all too familiar with how Big Oil and Big Auto works, and they never work for anything else other than their own interest.
Coming from a country without "Big Oil", I only know our Auto companies. And when I read Julian's analysis or the discussion in this thread in general, there are some points I just have to disagree with - or at least points that I just don't get.
First, this so-called "cannibalization". What's that supposed to be all about?
Imagine the following future scenario: BMW offers a great 3-series EV, they also offer standard 3-series gas and diesel engines at the same time. I would image that pricing would be such that BMW doesn't lose money on any of those offerings.
Why on Earth then would BMW care whether a customer bought an EV 3-series vs. a gas or diesel 3-series? As long as the customer is buying a BMW, and not a C-class, A4 or whatever the competition offers, I am certain BMW would be happy.
Then there is the whole "threat" idea I just don't understand.
Think for a minute. Tesla is selling what, say 50K vehicles a year (at the very best) at the moment, realistically far less?
VW, BMW, Audi, Merc, Toyota etc. are selling hundreds of thousands, no millions of cars a year. So - at least at the moment - Tesla is no "threat" to them in any way - nor will it be even if Gen III sells 200K vehicles a year.
It's the same situation the other way round. Even if VW succeeds in selling 100K e-Golf and e-up! vehicles, that wouldn't be a "threat" to Tesla, as those cars are no competition for Tesla. No one can tell me that someone in the BEV market is deciding between a 100K Euro Model S and a 40K Euro e-Golf for example.
And what is so bad about PHEV's as a transition medium? A lot of people (I would dare say the majority of the current car buying public) just wouldn't dream of buying a BEV at the moment (range anxiety, too expensive, unproven technology, all kinds of other misgivings, whether subjective or true - no matter). But PHEV cars imho can make transition easier for a lot of people. Overall range is basically the same as any gas or diesel car, yet you get (at least for shorter distances like the average daily commute) the EV benefits like great acceleration, quiet cabin, ease of use etc.
So almost "subconsciously" the average driver can experience what is great about EVs without giving up the "feel" of a conventional ICE. I am sure that someone who experiences a PHEV now will be very susceptible to buying a BEV in a few years time when battery technology has evolved even further.
Just my two cents.