The Tesla 3 is not being released next year, unfortunately. The Tesla X is. The 3 is still a bit away - 2017 or later.
With that said, slugline has hit the nail on the head. Electronics depreciate rapidly due to incompatibilities, either in hardware, or protocol, or simply horsepower - older computers can't run the workloads expected both by users and content creators.
Consider these examples:
- An old computer that was built well in 2009 is still good today in terms of performance, but not power. If I compare my laptop versus new ones in the same price range, battery life has improved 5x (900%) while performance has improved maybe 25-50% depending on the workload. (Or 400% if you're running something very specific.) As such, it has no real cash value anymore but it's still a valuable tool and prevents me from buying a new laptop.
If there were a strong market for old but useful computers, it would be worth several hundred bucks - the only real reason its cash value is approximately zero is because no such market exists, because most people don't buy computer hardware intended to last 5+ years.
- An old digital camera depreciates in waves, coinciding with the releases of new digital cameras to replace it, and price markdowns from OEM and retailers. For example, a $3500 camera might be sold used at $3000 for eight months before it suddenly drops five hundred bucks due to a permanent price cut, then again a year later, then drop half its price when the new version is announced and sold. However, at a certain point, the price of digital cameras stabilize and they do not drop any further. This is because there is a strong market for old cameras, and this is because cameras solve a human perception problem - reproducing an image - and once this is solved it doesn't suddenly become unsolved when it gets technologically obsolete. The cameras themselves may break, or the sensors may die, or the processors; and their file formats may become unsupported by some software, and the price of their data cards might rise as they become near obsolete, but that's about it.
- On the other hand, camera lenses drop a small amount of value upon being sold, then never drop in value again unless they are discounted permanently, or they are made obsolete by a better lens made for the same use but with better performance, or unless it gets damaged. This is despite modern lenses having oddles of electronics - basically, until it stops working the value people will pay doesn't drop.
In the same ways, modern features on cars don't decrease the value of current cars... much. An expectation of better MPG might, better performance might, better handling might, but all of these will be rather minor decreases. As long as a car runs and is in decent condition, its price basically stops dropping after a certain point. If there are external forces, such as roads that old cars can't drive on, or legal mandates, or much higher insurance costs, that might do it.