If you're going to the trouble of ripping up floors then fit the better cable for the reasons I stated above. A home wired network still has value one of them is the ability to support PoE which may come in handy if the need arises. Wired data centres are not going away, discrete networks still rule even with the emergence of converged networks. WiFi make work in a small office situation but its shared bandwidth is an issue as you scale up.
Listening in a Foo free Zone...
Only a Sith deals in absolutes.