"Anyway, single-mode fiber seems like a much more efficient, spectrum-thrifty, and "ecological" way to move bits, than towers and microwave-mmwave transmitters and the occasional radar-blinded aircraft."
If only people did what is the most efficient & "ecological". I've been using the most efficient form of transportation known to humankind for 2 centuries now for over a decade. Nobody cares. Ain't nobody giving up their cars. Ain't nobody giving up their cell phone. I wish I could have a landline for $10 / mth and a phone that doesn't cost hundreds of dollars and can all to easily be damaged or destroyed.