Friendly Forward Observer.
Fundamental ~ If new battery can last a million miles, then how many cars will I need to purchase over a lifetime? We, my life-partner (wife) and I, have purchased over 47 years together around eighteen, mostly new cars/trucks. Looking forward, probably will not replace the Model X. Option I ~ is to buy newer X down the road and pass the old one down to daughters family. Option II ~ keep until/forever. The fossil fuel vehicle (truck) will find its time/usage limited ~ needed to haul load or high base to get out during snow buildup. With COVID-19 mileage reduced significantly. Two years ago, I had to shovel the X out of snow.
Therefore, if the need to purchase a new car is reduced; that significantly reduces the purchase of new cars/trucks across the board. Used Tesla vehicles like any used car puts the brand steering-wheel in the hands of people that cannot/do not have the luxury to buy
new cars every couple of years.
Template example. If I purchase one Tesla car VS Joe Fossil buying three new GM, Ford, etc, why is saving more money? Less time fossil fueling at station, as opposed to Supercharger and Starbucks on double star day. FYI ~ we have not used a Supercharger in over a year. I do not miss the filling station social scene with our truck at all ~ thank you very much.
While new Tesla's account for about 1% +/- (hope I got that right) of the market, look down range for impact of Tesla's ~ not the monthly sales.
The impact will be grater than the nose on our face. People are still born with noses ~ right?