In the US, this has happened three times already: in the 80s, channels 70-83 were reallocated to cell phones; in 2008, channels 52-69 were reallocated to cell phones; in 2016, channels 38-51 were reallocated to cell phones. So cell phones have already taken half the spectrum originally allocated to OTA tv.
Seems like it's in the wrong part of the spectrum to be very useful for wifi. IMHO, it would propagate too easily for dense residential (or dense office), which is where congestion is most apparent.
