I have a heavy investment in R glass, including for instance the 35-70/2.8 Vario Elmarit. For the time being, and before resolving to go the Leotax path, I use the R lenses on the G1.
It would not look too difficult nor extremely expensive to build (perhaps by Panasonic) a full-format G1 with the M9 sensor. No need of AF nor IS for the base model, just be able to use existing lenses manually. If it does well, later add AF and IS and compatible lenses that would open a new lens market for Leica.
Sign this petition. If it will not achieve anything, at least we tried our best