I do not see any technical reason why this cannot work. Take for example the Lenevo Helix. In tablet mode, the processor is clocked down to something like 7 watts of power draw since the battery life and heat output would make it unusable. However, when it is docked, it goes up to full speed with the help if some additional cooling in the dock which pulls air through the tablet.
I think there are several people like me, who have no interest in buying a tablet for media consumption, but rather for working.
I work in a laboratory environment, in which I create several reports each day, which others and I must sign. My ideal is that I just pull the "tablet" out of the dock and walk over and have the other person sign the report with the stylus.
If I have a tablet, I expect to be able to work on it. I expect to be able to pop in my USB stick or SD card to adjust some photos I took while on holiday.
Why should a tablet not be an ultra portable PC? Why should it only be for consuming?
So, Yes Windows 8 UI is crap. I admit it. BUT, it is STILL windows and with Windows I can create content in a meaningful way that I cannot do on iOS or Android.
I guess I am just too "old" and don't "get it".