But the thing is that anyone buying an extended range Tesla already is buying a battery that big. So do they sell? Yes they do. The difference would be that you get a car that holds less than half the people but goes some 3 times the distance. Overkill to me and most people here, yes? But even with a battery that's a third that it would still work in most places most of the year.
Nobody said solar panels are a plug-in replacement either. If it doesn't work for you during the winter that doesn't mean it won't be worth it during the summer. My air conditioner doesn't help me much in the winter. That doesn't mean I'm going to rip it out of my car just because of that reason.
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