In a year or two, I'd venture to say the majority of consumer devices will have a touch screen.
It's going to be a LOT more than a "year or two" before everyone with a desktop PC has thrown away their perfectly good non-touchscreen monitor for a touch screen, and it will be even longer before that touch screen becomes a primary input device (if ever). Fingers are fat and clunky. You can't use touch input for anything that requires great precision.

There's a reason we've been using mice for 25+ years- it's a sound, well thought out and functional input device.

edit: sorry for doublepost