Historic and present demand are terrible ways of predicting future demand when it comes to technology. Most people don't know what they want because they're living in yesterday, but wait five years when they see what their early adopter neighbors are doing, then suddenly everybody would be happy with gigabit service, and who needs to upgrade to 10GbE anyway?

You could easily have said that nobody would want more than 128kb/s ISDN, because nobody does anything more intensive than download music, check e-mail, and watch flash animations. Faster speeds made newer services, services that are used by very ordinary people (like Netflix, Hangouts, Skype) possible.