Re: Why ?
"As you said, the idea that anyone would install copper on newbuild now, especially at $4500/tonne, is crazy. Retrofitting FTTH will be expensive, none of this £25bn that's tossed around. But the point is 30Mb, 100Mb, 1Gb, it'll all look pretty shit in twenty years time. 1Gb is only about 30 times faster than 'standard' 30Mb, so by my earlier rough guesstimate, just using current growth we'd be looking at needing to upgrade that again in ten-fifteen years time."
One, fiber is not at its theoretical limits. More data can be stuffed down a single fiber.
Two, digging is the expensive part. Once you've got the trench open, given how small a fiber is, why not over-provision it? How much more will it cost to bury say 100 times the fibers you intend to lay down originally?