Many many people I know do not use a DSLR for the following reasons (including me):If price is not an issue, the person is not interested in photography..... !!!
-Loud shutter noise(Bad for street shooting):The rangefinders own at this
-Too bulky(Bad for street and not good for neck/back):The rangefinders own at this again
-Vibration from mirror slap(Bad for low-light and night photography):The rangefinders own at this yet again
-Low resolution/sensor size compared to film(medium/large) format, colours not as crazy as Velvia, low contrast BnW compared to most BnW films.
-Does not force you to think before shooting compared to film photography where you know that every shot must be a "kill"