Other sources of acquisition are no different than reputation as far as being a source is concerned. They are all "gated" behind something if you will. Whether it be materials produced by said profession, required by it, a reputation, or one of those examples I gave, such as boss drops, zones drop, etcetera.
Timbermaw Hold had two sources: Killing furbolgs, and turning in drops from those furbolgs that were BoP. So, really, only one, just a stacking source.
And hey, they have more recipes than the August Celestials!
Now, if you wish to complain about Shado-Pan or August Celestials being blocked behind Golden Lotus, I'm all for that changing, maybe being unlocked by an epic quest or something that shows you're a somewhat competent 90 that has made the effort to not be in ilvl <400 garbage. It can be a lore party for all the rp-happy folks, and give cinematics and shiny things for all the instant gratification junkies who want their reputations and want them now but don't want to call J.G. Wentworth.
Timbermaw Hold doesn't have end game recipes and at least it did have two sources not just one.