ummmmm who said anything about discontinuing the touch? if they add 3G then it will be just like the ipad. Seperate model, and pay as you go. (menaing you don't pay month to month)
and theres nothing wrong with making it a tad bit thicker.
No I'm not saying they will discontinue the iPod touch. The iPod touch now is currently like the 3gs except without the 3g and phone capabilities. If they add 3g to the touch, the only thing that will distinguish it from the iPhone is the phone app. If they do that, they might as well discontinue the touch.