"The Model S loaners will be available for immediate purchase at a price that is lower by 1 percent per month of age and $1 per mile. If you like the service loaner more than your other car, you can just keep it."
I must say, if it works the way I think it works (pay for the $1 per mile difference between your car and the loaner, and then extra for features that the loaner has that your car doesn't), the ability to swap out a car for a loaner would be an insane upsell for me, and probably a lot of people.
Tesla should elaborate on this more. (This time a calculator is totally called for!)
If this can become a more formal program (which I admit would work better in WA than in CA, since we don't have EV sales tax), I would never dream of doing anything
other than ticking on every option out there when I designed my car.
Reason is then I can finance e.g. $110k for a P85, and then every year just pay in the mileage difference (let's say $10k cash to cover 12'500k miles vs. loaner 2'500 miles) and have a perpetual new car for life. Maybe a few thousand here and there more due to newer features that come online - but worth it.
On the other hand, had I started off with a non-loaded 60kWh, parting with $40k cash to do the first trade-up would require some thought.
So I think if Tesla can formalize this and help with regulatory hurdles (registration, taxes etc.), this is going to significantly push sales figures on the high-end P85 side over the other models.
*EDIT* My math was off. I forgot about depreciation. Knew something was too good to be true. So a perpetual new car would cost you ~$22k per year - not $10k per year. Well, I wonder what would happen if you trade in once every 29 days...
Ahh well, but it's still to know that you have some way to get hold of the latest must-have features (e.g. the situation P85 owners are in now that there's a P85+). But I wouldn't do it yearly just for the new car smell.