Phones make a lot of sense for touch, and by extension, multi-touch. Partly because they're small, partly because they were designed for them all along (even Windows Mobile started from stylus origins, Symbian did mess up the switch though). But for the desktop, what we have is fine. I'd buy any gimmicky, multi-touch mouse out there (and I have a MX Air), but to say the mouse is dead - that's sensationalism.
Edit - If the mouse goes away, it'd probably be due to a major paradigm shift in how we interact with our computers. I doubt a scaled up iPhone or multi-touch grafted mice is quite enough. That's probably why these are concepts with no plans for commercialization.