Is v0002 free the same thing like Minecraft Version 0.30?
What does this even have to do with porting Blockland to Unity? You're in the wrong topic.
OT: I could see it happening, but many of the current features would be slimmed down or removed if on unity. However, I imagine there would be many other good features. For one, the shaders wouldn't be stuff like they are now. Also, as others have stated, the Oculus Rift would be easily usable inside of Blockland, which is actually a big turn on for me. I just don't see it being very moddable. I mean, there are some Unity games that can be modded, (like Kerbal Space Program, which is run on Unity, as far as I'm aware) but the only question is how easy that would be to implement.
Even if he could work out a system to port all of the current features over, and still have room for more features, I couldn't ever see it happening quick enough to be of any benefit. His lack of work on the current versions would make people leave, and eventually people would see it as a dead project and quit. Blockland would end up dying before he could ever finish a stable release on the Unity engine.
Whether Blockland would die or not, it would still probably end up taking as little as two or three years to do, and even then it would only be as good as, for example, v8.