Survival of the fittest. This is why I don't recommend the privates as a place to make a career in EMS. The local gov't ultimately reserves the right to run EMS as they see fit. I hate to see people lose their jobs, but it's an "us or them" mentality. If it's a choice of my job or the next guy's, I choose to keep mine. I'm not going to let my family starve if I have a way to prevent that.
The IAFF uses yellow shirts to provide high visibility by choice. Because it works. Look at the video. Who jumps out at you, and appear to be in greater number?