We also really like our S's sunroof and use it a lot. However, as others have pointed out. Unless and until Tesla has real competition they can de-content their cars to produce them more cheaply and still sell all they can make.
You have a point but at some point it will start affecting sales. We might be tempted to trade in our Model S for a newer one but not if it means the new car lacks a sunroof. I don;t think decontenting the Model S and removing extremely popular options such as the sunroof will ultimately be beneficial for sales.