Quite simply because the world has changed, is changing and will continue to change.
It's the way of things. Sure, there might be nothing new under the sun, but change is always happening.
Look, you just changed too.
So, with that in mind, here's something to shake your thinking: The Collapse of Complex Business Models by Clay Shirky.
Take 10 minutes to read this and then post your thoughts on how this might impact the way you live...