Well I can't say I fully agree on the transistors being 3D, first of all, they always where manufactured in 3D, only now they are a bit extruded from their previous designs.
What I see coming may be REAL 3D transistors, that could conduct electricity on a vertical, as well as on a traditional horizontal plane.
That way CPU processors won't become cookie shaped flat rectangle squares, but cubes!
The technology is not there yet to make such things on a mass scale, however, I would not be surprised if Intel or IBM have been able to manufacture a chip with two or more vertical layers of transistors on top of each other. The hardest part would probably be to align the top layer with the bottom, which is kind of like technologies today thought to be impossible, or at least very difficult to achieve and unaffordably expensive to manufacture many years ago.
I believe we have reached a point where the average human being is no longer searching or hoping for the fastest computer, but for the one with best energy efficiency; because computers today have reached a level where most people can do with them what they want, without feeling limited to slow hardware.
Kind of the same way that the automotive industry is going to, what matters more today is having environment friendly devices that save money in the long run, rather than powerful mammoths in the bedroom that suck $1000's of dollars of electricity per year, even when just browsing online!
For that purpose I stated that Moore's law is going to be over very soon. Especially since Intel's newer technology offers greater performance, for lower power consumption, we might assume that most people can do with processors built on this technology with LESS transistors, instead of more, since performance increased by 20-35% on these newer technologies.
The few customers that will want transistors to increase will be web servers (like cloud, search engines, etc...), rendering farms, businesses, and small businesses like those that convert multimedia like movies and audio on a regular base.
The end user is going to have more experiences with Cloud servers, and aside from playing an occasional game, is probably going to have more than enough cpu processing power for the jobs he needs to do!