Here's what could improve my X-Pro1:
OVF framelines visible even in bright light. That might be done by black lines when light is bright, by thicker lines, whatever. But I frame my shots, so I might be an exception.
An EVF with a faster refresh rate, bigger and more realistic. That might be done by cramming in the EVF used in the X-T1. But I use a viewfinder, not the rear LCD, 90 percent of the time, so I might be an exception.
A click when I am in manual focus with a third-party lens and I hit focus. That probably requires use of some focus-sensing pixels on the sensors. But I often shoot with third-party MF primes, so I might be an exception.
Camera JPGs at even less compression that the current Fine setting. That requires fast enough electronic throughput. But I often want to do minor adjustments on the camera JPG (although I always shoot the raw file, too), so I might be an exception.
Gee, I forgot to demand more pixels. I guess I am not a photographer.