Will Voice & Gestures Replace Keyboards & Mouse?

short answer no. atleast as of now or coming few years.

I would say yes. A big yes and that is totally possible but it would take time to adapt to various countries as there is a big issue of the accent being used. Making applications or devices detect the accent according to the location or something like that is seriously a critical issue but at the same it is not doable. So we can expect something more outta these devices as we have seen from the normal keyboard and mouse stuff how technology evolved into touch screens and now with an example of Google Glass, it is possible for voice interfaces to take over too.

I say it won't replace, but they would surely dominate. Because admit it, not all the old things die out that soon.

Every technology has its own way of developing and in the past decade we have seen how people tend to flow towards the think that is Cool as well as Cheap. Voice and gestures are cool but from point of security, they are quite vulnerable even at extreme developed stage If a contemporary bio-metric authorization is not assigned supplemented with it. They will surely dominate over hardware and as we have already seen, this innovation is already materialized, "Google Glass". It is the first version but it may not be primitive to say that this technology will evolve into something that "HAS A HARD POTENTIAL" to replace all the laptops and phones. It has a "Huge Potential" but that is gonna take a long way to go through. Voice and Gestures are not comfortable to use in public, it will be safe in private environment. so in countries like India, it won't replace hardware but in other nations where people have more 'space' they can rule and bring a big transformation.