As others have noted, digital has facilitated a marked increase in the number of exposures taken, while the Internet has allowed easy dissemination of these photos. So now, not only do we see the festering meat trimmings, but there are also much more festering trimmings to be seen.
I understand how the influx of 'street shots' might appear to stand out, but if we look around, and again, as others have noted, similar trends can be witnessed in most any other genre.
When I first started taking candids, it required overcoming a psychological barrier (shyness/introversion) that still hinders me to some degree. The point is that the act of photographing a stranger stirred a certain excitement not repeated with other types of photography.
I suspect, and it's only an assumption, that in some cases, you have beginners who are just so giddy to overcome their inhibitions, that they show off their 'trophies' without realizing, or perhaps without caring, that others will view the same but with objective detachment and greater scrutiny. To stress, I'm only referring to a segment, but it's possibly something to consider.
I probably followed a similar path, where the sake of overcoming the challenge eventually lost its influence over the shutter release. As time has passed, deepening familiarity with the genre, as well as the repetitiveness of my own shots, have continually forced at least a desire for change, however stunted such evolutional aspirations might actually be.
For myself, I enjoy shooting objects outside, whether organic or not. I also like cities. Worse yet, I like black & white; can't help it. So my stuff invariably plops itself into the general presumptions of street, although I'm quite sure I would go through a similar routine if you shuttled me out to the rural hinterlands; just the subject matter would change. And yes, I would still be shooting Tri-X if I were traveling about India right during Holi.
My point is that whether annoyingly trendy or not; whether heavily afflicted by pretentious superficiality or not, or whether generally boring or not; I'm pretty much stuck doing what I like, because, it's what I like. And as a hobbyist, the freedom of self-indulgence is mine to enjoy. That doesn't mean I'm content with my specific work, but jumping out of a particular style just to be anti-fashion would ultimately be fashionable and forced.