I can see that this tech can be great to play with and as experimenting with concepts can be quite a pleasure to many people.
Does it make your bike go faster more easily? Is it more reliable and less mainteneance? I really don't think so. I most certainly will not be setting off across muddy wet hills with kit like that anytime soon myself, either on or off road.
The bit I really like in the linked to article is where it says; ". . . weight difference between them and the mechanical group has narrowed to a mere six ounces . . ." My alternative fraziology (?) was more like; Cor blimey - you pays all that money and it weighs nearly half a pound more!
Rather like disc brakes on light road bikes - You spend loads a time, thought and money on making them slick light and streamlined - then spend even more on screwing all that up and stopping them

. However I'm not supposed to be the sarcastic one round here. . .