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)
And Tesla itself would disagree as it has stated 70% after 7 years/100k miles.
I'd be careful to compare with the Roadster either way.
Citation? I've never heard of Tesla claiming anything close to that.
Any citations for whatever you've heard.
How do you know? Why are you so certain? Where do you pull these numbers from?
It seems like a surefire recipe to ruin one's credibility.
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 of user experience than any other car in the market IMO. This will help resale value.
Another point is that current users are experiencing very little degradation on their batteries, even after 20-30k miles of usage. After 5 years/70k miles, the battery will probably still be at 95% capacity and this will help resale as well.
Also, with EVs in general you are buying not just the car but the battery. Think of it as you're buying your future gasoline with the car purchase (of course this isn't a perfect analogy because you still need to pay for electricity), so that's why EVs tend to have fairly good resale value.
Lastly, Tesla demonstrated a battery swap (in less than a few minutes) last year (https://www.youtube.com/watch?v=H5V0vL3nnHY). They've hinted that eventually you'll be able to upgrade your pack by paying the difference in value between your used pack and the new pack. No details have come out on this as of yet.