Fair enough, although I think Vivek is right in saying that if such a thing is done, it won't be done by Leica -- they're too invested (both financially and philosophically) in tradition.
Now that Panasonic has proven that it's possible to make an electronic viewfinder that will be acceptable to serious photographers, it will become possible to rethink a lot of camera-design paradigms.
Over the years, most of the diversity in camera design has come not from the basics of enclosing the lens and imager (which hasn't really changed since the camera obscura) but in how you're supposed to aim and focus the dratted thing! Now that the viewfinder only needs to be connected to the imaging system electronically, rather than physically or optically, pretty much anything should be possible. To pull an example out of the air, how would you like to hold the camera like a flashlight, aiming it via a wirelessly connected, head-mounted eyepiece?
No reason that couldn't be done. Whether a manufacturer would dare make it, or people would buy it, is another thing...