This might not be related, but my main doubts about buying a model 3 is Adam ruins everything (electric car episode):
https://www.youtube.com/watch?v=MQLbakWESkwHe mentions that you can't shop your way out of global warming and that the environmental cost of building a new car creates a much larger carbon footprint than driving a used car.
But upon more research, this is not exactly true: http://www.greencarreports.com/news/1093657_buying-a-new-car...
"The study reveals that fully 75 percent of a car's lifetime carbon emissions stem from the fuel it burns, not its production. A further 19 percent of that is production and transportation of the fuel, leaving just six percent for the car's manufacture."
Hopefully this helps resolve those who have this particular doubt about getting a model 3.