[NickM]

Not that I'm disputing your point, but I think a lot of people make assumptions about EV batteries that aren't necessarily true. Nobody really knows for sure right now, but I think it's very possible that a Tesla battery pack might last for quite a long time.

I know in the past I've thought "hey, my iPod battery lost most of its capacity after five years, I guess li-ion batteries just don't have that much longevity." What I didn't know at the time was that different types of lithium ion battery chemistries yield drastically different lifespans. Studies have also repeatedly shown that temperature makes an enormous difference to longevity, and the Model S has a pretty fancy HVAC system designed to keep the battery within an optimum temperature range as much as possible.

Again, I agree with you that it's hard to really have any idea what the resale value will be in the future. But if we're guessing blindly, I don't think it's totally unreasonable to make an optimistic guess.