said by Alex J :Try looking around for companies that publish statistics about their usage growth that go into comparisons between average and peak traffic growth, they all agree with numbers similar to Cisco's... 30-35%/year average, 50-60% peak.
Story above pretty clearly highlights Cisco's predictions are inflated. Two guesses why. One should be "to sell hardware."
You do not need to believe Cisco, Sandvines, Akamai or anybody else, just visit the statistics pages from any internet exchange, they all show similar trends as well.
Here are the stats page from two of the largest internet exchanges in the world:
That 50-60% does not only exist in Cisco's and other equipment manufacturers' papers, it also exists in the real world.