You can have my mechanical keyboard when you pry it out of my cold, dead fingers.
It's cool as a design study, but that full-size-ish mechanical keyboards will remain popular as long as working with more than a paragraph of text at a time remains popular. A device like this could probably do fairly well around the $500 price point, but I think it would be very niche much higher than that.
What I would like to see is a better implementation of the basic concept behind the Touchbook - a tablet that becomes a clamshell notebook when attached to a removable keyboard/base. That base should certainly include an extra battery and might also add more processing power, storage and connectivity.
Very interesting idea, I think OLEDs are still very expensive but they have started to show up in consumer electronics in small sizes. This combined with 10GUI.com interface enhancements and it would be awesome.
I still wish there was a way to do more tactile keyboard. My wish is a gel keyboard win with you partly immerse your fingers and keys are configurable in software.
Slates are the way forward.