Hackers are already ripped apart Teslas and building things from the parts. It's VERY common to use the battery packs (thus their high resale value). Motors are popular as well. Sure there's some crypto/DRM for things like the car's identity (and if it has free supercharging for life). But generally a large part of a Tesla would be usable even 100 years from now, even if Tesla (the company) is dead.