Uechi-ryu, as I have always (and continue) to teach, is a "lifelong" activity that works on a mental, physical and to a certain extent, spiritual levels of the participants.
I agree fully with that statement for most martial arts, and it's the way I've been training also. I do think we have run into the problem that often the martial aspect of the arts has be relegated to somewhere beneath "teaching discipline, manners, anti bullying methods and other social qualities" and trying to keep it a life long activity.
In my view things like manners, self control and dojo etiquette are important and supportive of our training so we don't break our partners too often, but they are not the reason the arts exist. And for some as they age they may have to bow out of some aspects of the art.
The mental, physical and spiritual (moral/ethical boundaries?) are even more important and supportive of our martial endeavors, and I do think we could flip that coin so the martial aspect is done to develop those attributes. Heck we could switch back and forth over and over though out our lives.
FWIW, I don't think anyone sells out if they have a successful dojo, it's a tough business, but I also find something appealing about 5 guys in a basement, garage, yard or barn working on the things that scare customers away from a store front. They may be the ones keeping the scary part of the arts alive.