Is there a market for a digital panoramic camera?

This would require a large sensor area and be produced in smaller numbers, so could would likely be in the same ballpark as medium format.    Medium format already gives you the option for extremely high resolution landscapes and wide angles of view.   All you would need to replicate the X-Pan is  to crop it to 2:1 format in photoshop.

I would also imagine that a 2:1 crop from from a D800 at 36MP taken with the 14-24 would still contain enough detail to beat an X-pan.