I think it's the way forward. No awkward cable routing, no taping cables to bars before putting tape on, no cable guides or frame drilling, no faffing around with barrel adjusters to set the indexing. I'll be amazed if ithe principle doesn't catch on and trickle down to mid range bikes within a few years.
The only negative I can see with this particular system is that you can't shift front and rear at the same time. I often drop down to the smaller chainring while simultaneously shifting a couple of cogs down at the rear.
I await Shimano's version with great interest.