I do not have too much to add to that, except that the idea of having a list of moves/move families (I know that there is one somewhere....) linked into a web might actually be a good idea for deciding what to learn next.
Like I said, some moves are required as a basis: TTNs and btb Weaves are a lot easier to learn after Butterflies and normal weaves. Other stuff, like throws, can be learned whenever is convenient.
Any such map would have to be personalised to a large extent I think.
Any other thoughts?
'We're all mad here. I'm mad, you're mad." [said the Cat.] "How do you know I'm mad?" said Alice. "You must be," said the Cat, "Or you wouldn't have come here." - Lewis Carroll, Alice's Adventures In Wonderland