If they take out the VF/RF and put in a digital finder, that will be the equivalent of replacing the VF with a mirror system--that is, a different camera, not a new version of the same. Is the Leicaflex a Leica M? Of course not. Would an electronic finder M-like camera be an M? Of course not.
Would they do it; replace the M with an EVF camera? Possibly. I don't see Leica as being the cleverest company in the photo world, so anything could happen. Ruining their main reason for existing is totally possible.
I could see the attraction of such a camera as a parallel line, though.