One solution is shutting off Wi-Fi completely (including the background network scanning), but you would lose benefits like automatically connecting to known Wi-Fi networks and improved location awareness for your apps. It also does nothing to help the situation for others.
Pry-Fi will prevent your device from announcing all the networks it knows to the outside world, but it will still allow background scanning and automatically connecting to Wi-Fi networks. While you are not connected to a Wi-Fi network, the MAC address will constantly be pseudo-randomized, following a pattern that still makes the trackers think you are a real person, but they will not encounter your MAC address again. This will slowly poison their tracking database with useless information.
When you do connect to a Wi-Fi network, unless you specify otherwise, your MAC address will also be randomized – the same MAC address will not be used the next time you connect to this or any other network.
Of course you should also keep in mind that tracking can be done in many ways, and these W-Fi signals are far from the only method in use.