The wired interface market - which encompasses all types of USB cable, as well as others (e.g. Thunderbolt or HDMI) - is estimated to have a compound annual growth rate of 6.2% well into the next decade. However, it appears that their wireless counterparts have the potential to outstrip them in the same general time-frame.
https://www.notebookcheck.net/Cable-based-connectivity-set-to-be-worth-US-34-billion-in-5-years.334532.0.html