I would have thought the big contribution to this kind of dynamic balancing would be the eventual ease of piloting it would give. It still might not make sense efficiency wise though.
Seeing this and saying: "These are just helicopters, but smaller" isn't very helpful.
The big difference between these and "real" helicopters (either realsize ones or RC helicopters) is that now these things are using a super fast feedback loop to find their balance.
This could definitely one day help piloting real helicopters: just like these feedback-looped quadcopters are way easier to fly than the RC copters...