You've never used an entire product category and you want to call it stupid? The first step to building good products is to understand how people use them.
Wireless headphones are about as stupid as wireless Internet.
Just like wired Internet, wired headphones will continue to have a place for people who need certain capabilities or ruggedness or etc., but for most people, wireless headphones are the way to go. Let me walk you through some of the advantages:
1. Working out. Wired headphones constantly get caught on things and sometimes get violently ripped from your ears.
2. Related to point one, any activity or job where you could risk a loose wire being caught is perfect for wireless headphones. It very well may be significantly safer.
3. Wireless headphones have bigger range than wires. You don't have to place your phone in your pants pockets, for instance, to use wireless headphones. You could even have your phone in your bag, and everything will still work. Much of women's fashion either has no pockets or pockets of little value. This is a major reason women carry around purses. But you can't use headphones with a phone in your purse, hence why women are often physically carrying their phones in your hands. With wireless headphones, they can keep their phone in their purse or jacket and still listen to music or respond to calls.
5. Or if you are doing something around the house, you don't always have to have your headphones on you at all times. This could be particularly useful if you are doing something like washing a car where you might get your pants wet and don't want to have your phone on you.
6. With this new class of wireless earbuds that are small and lightweight, you could keep one of two of them in much of your day to answer phone calls or ask Siri or Google questions.