As amusing as your wordplay might be, the point being made is that Notch's coding skill should not be idolized or used as a reference for writing good code. A tangible consequence of his inability is that Minecraft takes up far more resources than it reasonably should and is very difficult to maintain, which has been echoed by several Mojang devs who have since picked it up.

Do you think they'll ever move away from Java?

Do you think Minecraft requires a complete rewrite to be maintainable?

I don't think they'll ever move away from Java. I don't think Minecraft requires something quite on the scale of a complete rewrite, but perhaps starting from scratch and pasting in bits and pieces of the original to save time would help things.

They are working on rewriting substantial portions of the codebase, but unfortunatley Notch didn't hand it off to the most skilled maintainers and they aren't making things much better.

they have already moved away from Java via JNI for some aspects of the game, like openGL 2.0 support.

I think this line of thought is a big problem in the development community.

There is a clear separation between code quality and shipping a successful products. Ideally you would want both if possible, but a product is not just code.

Ideally both, but if I had to sacrifice code quality for a successful product I would sort in exponential time if it meant getting a working product out the door faster. It doesn't need to be good, just good enough. (IMO obviously)