I think Tesla has mentioned that as battery technology improves, they'll offer a prorated replacement to folks with older technology. I don't know that it will make financial sense, but it's an interesting ploy.
Depending on what they do with the Model X and the rumored smaller platform, we could very well end up with a Tesla as our next car. I've tried to make a used Roadster make sense for my daily driver, but haven't been able to make it work from a strictly financial standpoint, but I do lean more and more towards ignoring the numbers.
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