Good. Anything that goes away from Unity is good. I dislike Unity because they refuse to make their web player for Linux. So several Newgrounds games don't work for Linux users due to Unity.
The Blend4Web Mars Rover demo here works perfectly for me in Linux btw, and guess what, the linked old Unity version says "unsupported platform", so, thank you NASA for thinking about more users :).
Unity's goal is to improve their WebGL builds, such that the experience is basically what you got with the WebPlayer, with the exception that no PlugIn is needed. This means, you are going to get the Unity WebPlayer experience on Linux thanks to WebGL.
The Blend4Web Mars Rover demo here works perfectly for me in Linux btw, and guess what, the linked old Unity version says "unsupported platform", so, thank you NASA for thinking about more users :).