Which also has the potential side benefit of quickly introducing pre-owned Teslas onto the EV market, straight from Tesla themselves. Could make Model S ownership a more affordable reality for some folks that otherwise couldn't afford one.

Good point, otherwise people might hang onto them for too long, without the specter of increased maintenance on the horizon to drive them to swap. I'm starting to think that the lack of mandated dealerships could actually be their ace in the hole to defend against the big guys once they get churning - being able to do things like this where Toyota can't easily follow, even if they reach technical parity. The day they start winning those lawsuits is the day I dump much more of my savings into their stock.

Agree. And I might also add that the "early adopters" of the Model S (current owners and those on the waiting list) would likely have the means to easily take advantage of a buyback program like this (and even jump at the opportunity to do so).