Earlier quoted context omitted.
Resale value in 5+ years out should be very good. I've been watching the used market for over a year and it's been very, very strong. There's not much used inventory being sold and owners seem to love the Model S's. The other factor with resale is that the Model S is light years ahead of any other cars in terms of technology. So, in 5 years the current center console of the Model S will still be far superior in terms…
"After 5 years/70k miles, the battery will probably still be at 95% capacity" No way. I'd say you have 75% tops (probably less with 70k miles). And unless you pre-buy a new battery you're going to be looking at a $20-30k replacement cost. Also note that it will likely be out of warranty at that point. And that Tesla values them at roughly $1 per mile (the price they give you for purchasing a loaner).
And the retention is closer to 85% at 100k miles: http://www.plugincars.com/tesla-roadster-battery-life-study-... (Keep in mind, the Roadster has a previous generation of battery pack technology)