This. I think there's a reason why so few motherboards currently have built in wifi. There just isn't really much market for it. If you don't need it, disable in the bios, take off the antennas if needed, and move on.
From a business perspective, Ethernet connection is almost a requirement for uptime/connection reasons alone. In the early stages of my mom's business, all her employee workstations were connected over wifi and were plagued with issues. Now that her business has further developed, everything almost has hard wired into the network for reliability reasons. Well paid employees can't do much when they can't have access to the data they need to get work done. Since moving to ethernet, network issues are few and far between.
The only place where i see the built in wifi getting more use is with prebuilt systems. This more inexperienced crowd probably won't have ethernet available in their room or where ever they set up their system so wifi is the only option of connection for them.
Wifi has definitely gotten better over the last couple years, but ethernet is still the way to go with desktops.