I'm a bit skeptical of this story about how MMA techniques are making their way into street fighting (link from Fight Opinion). Although they're not very specific, they apparently are referring to ground fighting and submission arts. I suppose that somebody might be able to pick up the guillotine or rear choke without too much training, but my personal experience is that most of submission grappling and wrestling is fairly tough to learn, and the vast majority of people who practice it are not interested in being street bullies. I think most trained fighters also understand that street fighting, potentially against multiple opponents and/or weapons is a different world.