The web was a side project. It changed the world. Linux was a side project. It also changed everything. Angry Birds was a side pro... wait, no it was a way to make money... and that's fine. I'm not trying to say, "Don't make money." I'm saying, making what people want gets you Angry Birds. Making what people need gets you the web.
So your point is that you should build something that you believe people will need even though this need/want doesn't yet exist. Ok, I can agree with that. But if you're going to run a company, you better build something people want now, or be able to make people want it, otherwise you'll go bankrupt.
