Actually he did.
"The full Safari engine is inside of iPhone. And so, you can write amazing Web 2.0 and Ajax apps that look exactly and behave exactly like apps on the iPhone. And these apps can integrate perfectly with iPhone services. They can make a call, they can send an email, they can look up a location on Google Maps.
And guess what? Theres no SDK that you need! Youve got everything you need if you know how to write apps using the most modern web standards to write amazing apps for the iPhone today. So developers, we think weve got a very sweet story for you. You can begin building your iPhone apps today"
Steve Jobs, MacWorld 2007. Source: http://www.cultofmac.com/125180/ste...arty-apps-for-the-iphone/#geEyccVqTQUS9eJY.99
If the iPhone stayed still having no apps, I am sure nobody would be using one now