I think Chris Crawford makes a good point, I think that some just shoot street because that's what HCB did, or that's what range finders are fashionable for.
I think the reality is that street photography is very easy, but almost impossible to do well.
It's easy because all you've got to do is go 5 minutes from your house and start taking black and white pictures of people walking down the street, ideally get in a couple of homeless guys, or perhaps capture someone in a blur of motion. I think it's almost impossible to do well, as at the end of the day, it's people walking down the street. That's what most of us in the Western world are sick of seeing every single day. The subject is very boring, unless you look for some deeper meaning, which either isn't there, or remains boring.
Maybe the key is to find a theme you find interesting, as Chris says, and try to work on that.