Well to start off, I want to say that the unlike many things that grow at a set rate, technology grows expedentially, meaning that the faster it grow the faster it grows....Not addition but Multiplication of knowledge and information.
In the past the jump from a 386 to a 486 processor was big, now we are jumping gigahertz, in the past we went from a 28.8kbps 33.6kbps to a 56kbps seemed like a big change, today we are jumping mbps you get the picture.
What I am trying to get at is that today there is not so much of bottleneck involved with the change of technology or the new ideas that may come.
With the speed of internet connections my guess would be the capability of a web based operating systems or web based applications.
There is so much of a push in the industry to move from a product to a service that this would make since as far as marketing for new age companies, and you will see this push already with microsoft office live and
google apps.
As far as updates you would never have to take the time to update anything, your computer now being more or less a terminal would just have the new version as it connected to the server/site the next time. Internet security would mostly be a thing of the past because all routing would be controlled at the data center not at a user level.
There is a lot of places this line of thinking can bring, discuss...