With varying intensity I've been following renewable energy development for many years. I've seen many proposals for new forms of wind energy, many of them looking promising. Same for new forms of solar, new forms of water power and many other things. The Kite approach isn't new either.
However the reality is that the only thing that's been successful for wind energy is to do almost the same thing they've been doing in the past, just bigger, better and cheaper. The biggest efficiency win in wind energy is to build similar technology, just with bigger wings and larger towers. The biggest innovation was to bring costs down. Technology got better in the details, the basic "three blades that spin around" stayed the same.
I know this is pretty boring. But it's successful. I'd bet on "make wind energy cheaper and larger" more than on any fancy new tech.