Touch screen is a very broad concept. It has been applied in numerous devices.
In the meaning of being available in a mobile, yes iPhone may lead currently, but I wouldn't consider a phone that has a price tag 900 euro to be considered mainstream, just because 17 million people (as zimbabwe sais above) have bought it.
My point of view is that in mobile phones, Nokia will be the one to take it mainstream as their strategy has always been various phones models and cheap ones.
However, since Windows will be supporting touch screen and Windows is 90% of the market, obviously Microsoft will put touch screen in a lot more hands than Apple.
Since no one can predict what will happen, this remains just speculation. But my point is you can't consider mainstream something that only few can access, at least currently.
You probably should consider the definition of mainstream, since a price-point really has nothing to do with its meaning. http://www.answers.com/mainstream
In the meaning of being available in a mobile, yes iPhone may lead currently, but I wouldn't consider a phone that has a price tag 900 euro to be considered mainstream, just because 17 million people (as zimbabwe sais above) have bought it.
My point of view is that in mobile phones, Nokia will be the one to take it mainstream as their strategy has always been various phones models and cheap ones.
However, since Windows will be supporting touch screen and Windows is 90% of the market, obviously Microsoft will put touch screen in a lot more hands than Apple.
Since no one can predict what will happen, this remains just speculation. But my point is you can't consider mainstream something that only few can access, at least currently.