Your argument was correct before video became common all over the internet...............all that video needs help moving around. If you're just talking about sending a simple e-mail it doesn't matter.
Video is buried in every corner of the internet today. Having Akamai service is mission critical for anyone managing a hyper connected work force. The cloud is getting more important every day.
its definitely necessary.. latency is a factor of distance. No matter how big the pipes, the speed is always limited by the speed of light. With one web page having typically 50 connections to render it, a CDN service will always help improve web site performance for users around the world.