People can insist that the MY does not matter and, when it comes to Roadster owners, they may well be right. However, when I go to sell this car in three years time (my average) I believe the market will have expanded well beyond the Roadster crowd. Those considering this car on the secondary market will not be Tesla or even EV types and will not be converted to the "this is new technology" thought process. I'm most certainly not and I've had my deposit in for some time. These buyers in the future will be your normal car buyer and they will look at someone selling a MY12 versus a MY13 and think "I would rather buy a three year old car than a four year old car if the price is not too much more".
I may be wrong about this as I have been wrong many times before. However, if I'm not buying the argument and I am an early adopter and Tesla fan, I'm reasonably sure the buyers of the future will not be buying it.