I think the underlying question in the original post is very valid and mostly the reason why I haven't bought yet.
What's next? No clue. It could be something completely useless to me, the things you need for your community may or may not be in the products future. There is no cohensive plan for the product outside of a few dudes writing some code for whatever their whims might be.
What is the long term goals for XenForo Ltd, the software, developer staff growth, etc. There are lots of important questions regarding the long term growth and viability of the product. Questions that so far, are ignored.
Again, look at XenForo business as a model. What is the model? (The obvious answer is not necessarily the truth). What are it's income sources, how does it appreciate marketshare, can it maintain growth with limited offerings, what new revnue adding offerings will help it grow the business, allow it more developers, etc.
Software evaluation is one thing, evaluating the business offering the software is another. I do both when I make my purchases. The software is solid, I'm just not yet convinced that the business is in the long term.