Network management Toolkit 
Story: Unlimited-broadband offers to go 'within a year'
Pachyderms and fibre
... and what an elephant it is, too.
The issue as I see it is not that bandwidth is un-expandable. It's that it won't be expanded in time to cope with the very sudden growth in usage that's happening right now.
a) "Unlimited" is and always was a truth-economy (I'm being kind here). Make it non-cost-effective, and it'll go away pretty sharpish.
b) Expanding bandwidth doesn't happen for free. See above.
c) I've heard so many people tell me, just in the last couple of months, that the intarwebs are being unusually slow/unreliable. Not that I've never heard this before, but it's just become more frequent recently.
Consumers are going to have to get used to the idea of choosing tiers of service. Fact is, the ISPs are talking about it and want to do it and, as for 21CN, that development is going to make segmentation a lot easier (tools for BT Wholesale's ISP clients, etc).
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