There are airborne optical alternatives that can beat the * out of fiber - provided the weather is clear.
Fibre provides more frequency and better SNR than you'll get in the air, thus more bits
But a single fiber provides ONE PATH. Optics can provide MANY paths.
Imagine ten thousand fibers. Now imagine the ends poking out of a billboard in a 100x100 array - behind a 100x100 array of collimating lenses that beams the light toward your house. At your house imagine a telescope imaging that billboard onto a slide containing another 100x100 array of fiber ends. (Of course the fibers work both ways0 The air path may be of lower quality than physical fibers, but it's hard to beat a four orders of magnitude more paths. You'd need to run an actual bundle of hundreds or thousands of fibers from the billboard site to your house to beat it.
Now go back to the billboard and insert another 100x100 array of fibers through it - slightly offset so the same set of lenses but beams toward your next-door neighbor's house. (We'll assume the array is spaced out sufficiently that an optical telescope can resolve the two houses.) Repeat for ALL the houses served.
Not practical as described, of course. But it shows the principle: Wireless paths can multiplex spatially and reuse the bandwidth a hysterical number of times.
(Of course a real system using spatial multiplexing could be expected to use various wave-mechanical hacks rather than actual resolved paths - just as MIMO does down at radio frequencies.)