90K M3 delivered or even produced in 2017 would be an incredibly impossible feat to achieve. I am sorry, I am just giving my opinions as someone who has followed the auto industry for a decade. Elon is insulting our intelligence when he throws out numbers like 90,000 in 2017 and 350,000 Model 3s in 2018 or 500,000 total in 2018. We need to appreciate how complex auto manufacturing really is. Ford, Tesla, Nissan, GM and BMW will collectively not sell 500,000 pure EVs globally in 2018, let alone Tesla doing it themselves. The 500,000th Model 3 will not be made before January 1 2021. This doesn't mean I doubt Tesla's success or domination of the EV market. It is highly unlikely that a million EVs will be sold in 2020, even when you combine the EV sales of all Non-Chinese automakers.
Would you have recommended that elon not start a rocket company, and then a re usable rocket ?
in fact do you know anybody on earth that would dare start a rocket company?
don't be so sure, maybe you don't know.