Maybe, but what about what Musk has done as a whole? If he can drive home-battery adoption, solar, and electric vehicles, and create markets where companies like GM, Ford, and the Euro manufacturers have to chase the new market, that has to make a huge impact. Obviously it's not going to completely remove our dependence (mainly plastics and shipping) but it will absolutely hit the bottom line of the most oppressive regimes funded by oil (Saudi Arabia). Also this will help us you know stop destroying entire mountain ranges and the largest CO2 sinks in North America for tar sands mining (Boreal Forest).

On the plastics front, just look at the news from earlier this week of Lego working to replace all of the plastics used in their toys with bio-plastics (or other non-oil based polymers). A few more efforts like that and plastics won't be anywhere near the driver of oil consumption they are now. That doesn't address shipping (which is horrendously polluting), but if that's the last one standing that's still a massive improvement.

Commercial aviation as well will never be electric. It would require two orders of magnitude energy to weight density, and quadruple flight times.

People also thought we would never get man into space :)

There is a big difference between simply thinking that something is too hard and having numbers to back it up.

Tesla has been proceeding according to his plan for a bit over a decade. He foresaw the value of it in 2006. At the very least, his insight accelerated the development and adoption of electric cars and solar power.