Except this is not how people shop cars, at least those who are not in the "cult of Tesla" and who are not early adopters.
If you are thinking of buying a Model S and go to the Tesla web site, you will see two cars at approximately the same price points. One is brand spanking new, with obviously newer design, technology, and vastly superior interior amenities and design (based on Musk's own words). Very few consumers will go for the outdated vehicle unless it is steeply discounted. Replace Model S with "iPhone 5" and Model X with "iPhone 6" in your statements and see if it still makes sense. It doesn't to me.
If a Model S redesign - to keep pace with Model X - is a year away, as you suggest, then Tesla is in BIG BIG trouble and so is our stock investment.
iPhone 5 and 6 (slightly bigger screen) are same basic design with different internals and only slightly different form factor. The Model S is a sedan and the Model X is a crossover. Someone considering a sedan might not be interested in a crossover vehicle and the other way around too. I have no idea if a refresh of the Model S design is coming soon or not but don't think the Model X being present will kill Model S sales. Maybe people who thought about buying a Model S would buy a Model X but that is still a sale for Tesla.
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