I think the point being made is that the "mouse" is considered by the majority as being an Apple invention because it was Apple that brought the mouse to the masses back in the early 80's. They didn't invent it, but it's still never been clear who actually did because there were a few patents around for very similar devices. Apple did the hard part and made the invention work.
Back OT, I doubt that Apple would replace the mouse or the track pad anytime soon, I just can't see it working.
There are uses in which touch screens are amazing. They are more intuitive. They interact directly with which you're attempting to interact with.
However. there are cases that a touch screen has absolutely no ability to replicate the precision of a pointer. The Speed in which you can move a pointer, and the accuracy.
A mouse pointer (trackpad) can be almost acurate to the pixel in which the pointer tip rests on. This is something no touch screen can replicate since well, your finger tip is more than 1 pixel big.