I can see a potential replacement for traditional mice in business environments, simply because of the resources (big money) and ergonomical advantages.
Although much consideration must be taken when it comes to gaming... otherwhise we might just get another wiimote on our hands... with frustrated gamers who instead of throwing their wiimotes on the screen, decides to punch it oldskool. Nasty.
Ordinary keyboards might get a significant upgrade before 2019. A great question that arises would be if traditional CAD-designers want to give up the mouse's precision and go for their fingertips. If so, then hopefully nimble ones.
New generations will be more likely to adapt to a wide use of touch technology, but as with almost all technologies, some will be quite frustrated over the lack of buttons...