Not sure if it's been confirmed here, but Quest 2 definitely supports Wifi 6, so it may be that the link cable is not actually needed, and wireless will work well, of course requires virtual desktop.
Carmack explained in the Connect Q&A (held in Horizons) that increased wi-fi bandwidth isn't necessarily the panacea for wireless VR that people think it is. A stable connection depends on a lot of other factors as well as bandwidth. Things like how many times packets need to be re-sent when they're lost, the latency of the wireless encoding and decoding and how congested your wi-fi channels are.
The main thing stopping official wireless PC VR functionality coming to Quest is political - Facebook don't want users experience to be soured by a poor wi-fi connection, so they're reluctant to do it, even if a large number of users would get an acceptable experience.
Carmack is continuing to argue that people are doing this now, with Quest 1 and software, and they find the experience worthwhile, so there is a use case out there, and a dedicated solution (say a specific wirelss dongle on a less congested frequency) would be a good product for some people.