FTTH uses only a very small portion of the bandwidth that long-haul fibres use (Think e.g. of bundling in parallel all the FFTH fibers in Australia being a much, much thicker cable that what is laid into the ocean or between territories). You will almost never use the actual optical bandwidth of FFTH fibers, since you couldn't afford the electronics and laser to modulate and demodulate.
Finally, a human being (optical resolution of the eye being 1 arc second) can probably not process much more information than about 4 HD channels would pack (sound is trivial in information density compared to video, so is touch, smell),
how much does a fiber optic technician make
so there appears to be not much need for an individual to be connected at download speeds that substantially exceed the limit of about 4 HD channels incoming and 4 HD channels outgoing. Multiply this by the size of a family.
FFTH optical bandwidth likely already exceeds our biological capacity to process, only the price of the electronic side might remain a practical limit for a few years.
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