For me, the M9 makes sense for the compactness, simplicity of operation and incredible image quality from the combination of the lenses and the sensor. Ideal travel camera - which is a big point for me, because I tend to do most of my photography while traveling. Plus I really like how the files look great straight out of the camera, without much need for PP to bring them to life. Having said this, I miss AF (even though I've become quite proficient with the RF) and, in the future, would ideally like to use an AF version of the Lux 50 Asph with an FF camera producing the same image quality like the M9, but with ultra-fast face detection /nearest eye recognition (like EP3). A high-res EVF would also be useful, especially if it allowed me to use wide lenses (like my 24 Elmarit) without the silly accessory finder and with accurate framing.... So no, the RF is definitely not why I use the M9, I could say I use it despite the RF.
In the meantime, I am eyeing the S2 (in full knowledge that it is not a bigger M9) - AF, accurate framing with wide lenses, incredible image quality straight from the camera...