If you are curious about this you should take a look at the electronics that go into airliners. My company makes a circuit board that uses Freescale processors and many other chips and they want us to guarantee availability for another 20 years. In fact I think we have orders on the books through 2026. During that time one of my successors will have the nice job of finding chips to build them if the various silicon manufacturers decide to shut down the line.
On another application we kept a product going for 5 years after the main chip went EOL by working with a company that specialized in licensing EOL designs just for this purpose
The thing about an automotive application in the console is that the "1000 or more parts" PCB that we are talking about can be replaced with an upgrade much more easily than anything that flies. Boeing has $20,000 circuit boards that were designed 25 years ago they still order even though I could replace the whole thing with a $15 FPGA on a $30 PCB today. The reason: you don't mess with flight critical components without millions of dollars of testing. The $20,000 assembly is cheaper.
In contrast the Tesla console could probably be redesigned in a few years with updated components and possibly even 100% software compatible. The barrier to getting it qualified would be far less even though the car is highly dependent on it working. So if you are making a list of things to be worried about in buying a Tesla this shouldn't be on it.