Car batteries would still have value. Even if a tesla car battery depleted to say 50% capacity, that is huge and could power a home many times over.
Ebikes. Yeah they are going to landfill mostly. If you thought bikes are getting wasteful now, ebikes is next level. Good luck trying to find an ebike battery that will fit your proprietory bike in a few years time! This is actually what is holding me back buying ebikes, not concern for environment, thats farked already, that I will likely get something that is oprhaned and won't be supported. Same with cars.