Ultimate Dream X camera(s): in no particular order:
1) A medium format equivalent to X100T, just scaled up. Would prefer a SQUARE sensor.
2) An E3 body with the largest size "APS" sensor possible relative to premium X lenses like 56/1.2 and 23/1.4. Would personally like this as a SQUARE sensor as well.
3) An E4 body with an ORGANIC sensor featuring the amazing sensor capabilities we've read about (resolution, dynamic range, etc.)
4) A simplified X camera with NO LCD SCREEN OR BUTTONS DIRECTLY ON BACK. Limited menus accessible via EVF only.
5) A standards-based lossless file format (PNG, JPG-2000).
6) Maybe a sensor based on some other alternate FUJI sensor layout patterns like the one with white as well as RGB pixels if it performs well, but forget about Bayer patterns.
7) Tripod threads should be relocated underneath lens axis, that's just plain silly.
8) If monochrome, would say in medium format only.