If Tesla sells this year 800,000 units of 2 tons each, and keep up 388% growth every year, then according to my calculations they will have depleted earths crust in a little over 19 years.

That's why there's SpaceX to mine asteroids! /s

By year 8, they'd be selling 2 cars per person on the planet - so any extrapolating that this growth rate can continue for even 4 years - must think we've reached the singularity and will soon be living in an alien world.

For context, by year 19, they'd be selling ~39M cars per person...