Elon Musk’s sleight of hand
medium.com
medium.com
Supposedly the Google self driving cars analyze a gig of data per second so more processing power would likely be needed too. That is not to say the platform may not be a self driving car at some future date... Also one good software bug that loses lives might be enough to destroy Tesla financially as well as their reputation at this stage.
These are all natural evolutions of luxury car features.
Tesla also have a smaller-format car to come.
Obviously things like seat and door technology, the snake charger, etc can be applied to other sizes.