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Running a signal down a wire is simply a better and cheaper way to hook up speakers. The latest systems use higher frequency 5.1 -57 GHz devices that won't interfere with cell phones or Wi-Fi networks, but all wireless systems potentially have sound-quality issues. Other types of systems rely on radio frequency (RF) systems that work between transmitter and receivers.
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Some wireless systems feature an infrared (IR) system that uses light waves, and those systems require line of sight between the transmitter and receivers to operate. Some wireless systems use small separate power amplifiers, and you have to run wires between the "wireless" amp and speakers.
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Oh, and there's also a wireless transmitter that needs to be plugged into an AC power outlet. That's a very significant advantage, but in a 5.1-channel wireless subwoofer-speaker system, you'll have to deal with six AC power cords (wires) that must be plugged into wall outlets. The key advantage wireless speakers have over wired speakers is that the wireless models' wires don't have to run across the room back to the AV receiver. So if you're keeping score, you'll see that wired and the best wireless speakers both have the same number of wires: one. Normal "wired" speakers get the music over the wire, and the power that travels over the same wire from the amplifiers in your AV receiver. "Wireless" speakers always have an AC power cable (wire) that needs to be plugged into the wall. If such a system were to exist, it would not only receive music signals wirelessly, but also AC power to run its internal amplifiers. It's a powerful fantasy: the totally wireless hi-fi or home theater speaker system.