Re: 3 & 4 Or, battery packs will degrade and people would not value them at all. And, more importantly it's very unlikely that Model S will hold any residual

Re: 3 & 4 Or, battery packs will degrade and people would not value them at all. And, more importantly it's very unlikely that Model S will hold any residual at all, especially in 8 years - it's essentially version 1 of technology (with Roadster being beta version). In 8 years Tesla itself will have version 3, or may be even 4, and version 1 will be just obsolete. Notice how people buy new Camrys instead of 8 year-old 740s.