So two things:
1) If you don't have a dog in this race, wait and see if Tesla really does achieve these goals. Outrageous claims require strong evidence.
2) If you're a competitor, now is not the time to fold your arms, look down your nose, and say it can't be done. Tesla has a 50/50 (30% chance? 60% chance?) chance of eating your lunch, so it's a gamble to assume they won't succeed. And if you're a luxury car maker, you don't need me to tell you that as the Model S is already eating your (high profit margin) lunch: "Tesla’s Model S outsells Mercedes S-Class, Porsche Panamera, and BMW 6/7 Series combined in the US" https://electrek.co/2017/05/26/tesls-model-s-leading-us-larg...
If you're a competitor, you really have only one option: assume Tesla will succeed and so try to compete like hell.