Re: What are people doing that needs fibre?
"Basically 10Mbps, 100Mbps, 1Gbps, 10Gbps... It doesn't matter if the speed sold equals to the maximum - we have these speed jumps (at physical level) to work with."
You're confusing line speed with interface speed. Depending on the technology employed there are lots of line speeds available between your interface speed steps.
G.SHDSL and EFM have lots of speed options in the 10-100MBps range, especially where multiple copper pairs are used.
WDM on fibre offers a typical throughput of 2.5Gbps per channel.
Networking 101: Line speed is not interface speed is not throughput speed.