Tesla will do to the legacy auto companies what Apple did to flip-phone companies. But it's not because legacy auto companies are bad at design (which they are), it's because they all, without exception, suck at software.
Here's a reminder re: Toyota's coding practices: https://news.ycombinator.com/item?id=9440094
Not one of them will be able to touch where Tesla will be in a few years from a software perspective, and that's where all the differentiating value will be in the coming wave of new automotive technology.