Ok, you just crossed the last piece of advantage the Model S has over Model X besides initial purchase price: cargo area. Not only can properly ordered and factory equipped X tow 5,000# of any medium bulky items on appropriate trailers, but it can haul cargo inside the back, and also mattress!
Now, the only reason anybody should purchase Model S is because it is cheaper. Model S can go further than Model X, but not by far; in each case, paying more for battery solves that. You could pay more and get a 100 Model X, but there's a 40K luxury tax right now for the stupid Ludicras mode on the X. Other than that, the 90 pack is OK, and price is the only thing holding most people back on the X, and maybe little things like cornering speed and garage height. Those seem like small things. There's reliability, but that's eclipsed now with the better X features.
To me, price is the only reason to get a Model S instead of Model X.