That is only likely to happen when there is a revolutionary breakthrough in battery technology.
Even so, the other factor that you can't overcome if the flange to sensor distance required by M lenses. Digital sensors are simply thicker than film and adding an LCD just compounds the problem.
Ignoring the battery issue, you might possibly thin out the body and simply make a pedestal for the flange mount so that it stays where it is, but I suspect that people will start complaining that the camera is uncomfortable to hold.
I can live with the size. The M240 is actually a tiny bit thin