As someone once said "I don't want to belong to any club that will accept me as a member."
And apart from that does it have to be a Fuji? I'm no fan boy and I don't really care who make it but here's my little wish list...
1/8000 mechanical shutter speed. It doesn't have to be mechanical but just something that doesn't give the rolling shutter type effect but I do want 1/8000 at least so that I can use wide apertures in good light without the use of ND's.
A state of the art EVF.
Auto ISO is all exposure modes including manual mode.
The ability to have constant preview in all modes.
Lenses with distance markings and DoF scales.
At the moment I have a Sony A7 and Panasonic G1 and GX7. The A7 is almost perfect except that the lenses are mostly without markings and turning the back screen off and on can't be assigned to a custom button and requires diving into the menu. If they'd put that one thing in a firmware update I'd be ecstatic. I don't suppose that could add a silent shutter with a firmware fix though, or could they?
??
My GX7 is pretty good but I don't like the EVF, it doesn't allow auto ISO in manual mode and only allows constant preview in manual. If they'd fix the latter two I'd be happier.
On the Fuji side...
1/8000 mechanical shutter.
Add a couple more raw high ISO settings.
If there is an issue, tell Adobe how to handle the raws.
Update the 35mm f1.4 to be more like the newer lenses.