I will second that eventually smart home (accent on home, not household) will go full wired, while semi-disposable gadgets may well stay wireless, but the idea of fully wireless home automation is now out of the windows for so many reasons.

I had a discussion with one guy from IKEA who bid on "full wireless" because "it is where Apple, and Google go."

The conversation went all went fine for him until a moment of Zen enlightenment hit him: "Outside Europe, people live in concrete houses." That very moment the smile vanishes from his face, and the guy looked like he felt a total facepalm moment.