I don't know how they will do it; I am not an expert on manufacturing or the auto industry. I'm only pointing out what makes sense, and Tesla tends to make logical decisions.
The following are the pillars to my argument. If you (or anyone) can disprove any of them, then please to do so:
- Demand for Model 3 is off the hooks. Nobody really knows how high it can go, but it seems to be surging.
- No competitor is even close to meeting this surge in demand for all-electric cars by at least 5 years.
- Tesla can significantly increase production plans if they deem it necessary. They have done so in the past, so it's possible.
- Tesla's mission necessitates dominating as much of the all-electric market as quickly as possible. It's their core purpose.
- They have, or can easily raise, the equity/debt capital needed to ramp production above 500k in 2018.
- US governors and int'l heads of state are clamoring over Tesla to open the next Gigafactory in their jurisdictions.
- EM & Tesla brands have hit inflection points, so the word is spreading like wildfire, even before July 28. Imagine after.
I expect to get a few answers to this (likely some from FUDsters), but I would be surprised if anyone can truly disprove any of the items I listed above. The weakest points in my argument: I don't know how quickly an additional line can be brought online or if Tesla can significantly increase lithium/cobalt etc. supply in one year.
Keep this in mind though: even if such steps would take more than 1-2-3 years, I'd be very surprised if Elon & Team, who saw the need for a Gigafactory at least five years of anyone else, hadn't been planning for a potential surge in demand that is now becoming a reality.