I think that the street photographer can be seen as an extension of the 'Flâneur', a delightful French concept of an observer of the streets (who was often a writer or artist).  These days I sometimes wonder where street photography is going though. On one hand there's the style of just photographing anyone that comes along, I guess documenting a simple record of the activity of the time. Or there are photographers that seek out (or manage to capture) an image that tells a story or shares a moment.