Removing Falcon Wing Doors off the Model X would be like removing Lambo Doors of a Lambo.
It is a unique differentiator that makes it appealing to so many (but not all)
As shown above, Tesla could easily price the car to qualify for Tax Credits by having a lower list price PLUS extra $ for the long range battery.
Tesla seems to have all the pricing power in the World. In business, the low cost producer has all the power. They can price for profit, for volume, for exclusivity, to increase or decrease demand, or to take advantage of governmental or Utility regulations.
Right now, X & S are tidy little profit centers. Their tooling costs were long ago amortized. They provide a flagship option for those wanting top of the line, or additional space. No need for all their production to be smaller economy boxes. Small-Medium-Large-Special use seems to be the plan.