"I still use my 1947 Contax IIa on a daily basis with its superb Stuttgart Carl Zeiss lens. That's why Contax is fading fast. I don't need to buy another camera from them... although I'd like to"

That's one of Leica's (many) problems... it is competing against its own used market. Leica shooters still use forty and fifty year old M2 and M3 cameras. If the camera breaks down a routine CLA is usually enough to put it back in service for many more years. Regardless whether corporate Leica ceases to exist (although I doubt that will happen) there are enough Leica bodies and lenses out there to last well beyond my lifetime.