IIRC, it's actually Toyota that's the world's most popular car maker (by number of cars sold, at 10.23 million last year), not VW; this has been the case for the last 3 years [0]. VW is very close behind, though, at 10.14 million (and GM is close behind that at 9.92 million).
Not to say that your point is inaccurate (it's actually very accurate; the ability for companies like Toyota to drive down costs goes a long way toward mass adoption, and it's something that "luxury" makers like Porsche don't typically have the experience in). Tesla could very well be an exception here, since the big focus as of late is to ramp up manufacturing until Model-whatevers (and, in particular, their batteries) can flow out of factories at ludicrous speeds.
Not to say that your point is inaccurate (it's actually very accurate; the ability for companies like Toyota to drive down costs goes a long way toward mass adoption, and it's something that "luxury" makers like Porsche don't typically have the experience in). Tesla could very well be an exception here, since the big focus as of late is to ramp up manufacturing until Model-whatevers (and, in particular, their batteries) can flow out of factories at ludicrous speeds.
[0]: http://www.telegraph.co.uk/finance/newsbysector/industry/113...