This is the question for all of the gathering classes being proposed. Like you, I can only think of a couple, and they are all available through other means. To warrant a new class you'd need 100s of nodes all giving a variety of unique items. Those items would have to be useful for something. So you'd probably have to create all new low level recipes to be retroactively added to various crafting classes.

Or you create a new gathering class that has it's completely separate eco system? In which case how do you envision that working?

I like the idea of a new gathering class, would be fun, but it won't happen in 3.0 series and... it also seems like a logistical nightmare.