Wii u emulators and xb360 and ps3 aren't done because to run you would need a very heavy duty pc.
I mean lets just break the wii u down. You would need whatever specs to run your pc plus 2gb extra ram to run wiiu emul. You would need greater than tri core processor for wii u emul. You would need to be able to emulate a ppc tri core processor and an ARM x64 processor at the same time. Let's not forget that the standard laptop may very well have the equal gfx card so emulating it in a program or vm you would probably overheat it. I mean seriously most of the current games for wii u would be like running 2 extra operating systems on top of the one you are running originally. And that's not even figuring in the OS needed to run the game and the menu.
How do you prevent people from building your console as a vm? You build it to operate on current hardware then run it at the max.
In 20 years when the wii u is dated and computers run programs larger than the wii u then it will be possible.
I'll put it this way the wii u runs a program, lets say a game. The wii u pretty much shuts everything else down (apparently not the browser...lol) and makes full use of both processors the gfx card and one gb of ram. The specs on a pc that would take to emulate it would be a pretty tall order to fill. And lets not forget about attempting to link it all with different parts and the countless hours it would take to program it all.
I just don't see anyone or any team/teams willing to spend that much time getting it to work only to find out it will suffer from buffer issues, pc overheats, and just sheer poor performance. Honestly, when these guys release the exploits I think people's time would be better spent on assisting with furthering homebrew development and other parts of wii u hacking.