It would be stupid to assume that Tesla, or any other EV automaker, hasn't thought about this scenario, so I'm sure there is a plan. 8 years/100,000 miles is a long time compared to battery innovation. It will almost always be the case for any owner that by the time a battery replacement is needed, the older technology was long "obsolete". It's true that Tesla can just keep making 2170s for repairs for as long as there are older models with it, but I'm hoping their strategy is the other way - make an "adapter" so newer battery can fit in older models. Wishful thinking, I know.