The latest headphone and earphone market research projects that this compound device category will "generate revenues of over US$45 Billion" between now and 2025. This growth is thought to be driven by several factors, which include the rise of the TWS earbud, the demand for "smart" features in this category and a demand for noise cancellation.
https://www.notebookcheck.net/The-combined-headphones-and-earphones-market-may-make-up-to-US-45-billion-in-5-years.454739.0.html