This was posted 4/15 on Electrek and must be here somewhere on TMC but I didn't find it. It's an interesting read and another angle on used car values. Basically a 10 year old Tesla's battery pack will then be used for storage. Example is an 85kwh battery can be worth $15000 to be used for energy storage.
Why Teslas may keep their resale value better than gas-burners
Why Teslas may keep their resale value better than gas-burners