To answer the OP's question, it would have to be as light, or lighter than existing mechanical systems, offer an aerodynamic advantage (i.e. no cables), have at least as good modulation and stopping power, have reliability equal to current systems, and not add more than a couple hundred dollars to the bike.
Meet those conditions and I'm all over it.
__________________
You could fall off a cliff and die.
You could get lost and die.
You could hit a tree and die.
OR YOU COULD STAY HOME AND FALL OFF THE COUCH AND DIE.