It can be made shorter. I'm not spending too much time on it right now since it's not released yet. The beauty of it is that it just takes a few number changes to change everything. It can be made much shorter and still look good.I think somewhere between the two would be ideal. I think generally even the Kunos 3D grass is a bit too long. It needs to be half the height or have more variance to be totally convincing.
Also realize this is a still shot. At speed you barely notice it other than the shadows have a nice roughness to them when compared to straight 2D.