All I got from that was another "Touhou is dying" rant, of which there have been many the past ten years.
I'm not going to respond there because I don't have an account and don't care to make one there, but....
Have you noticed that something is not right? Have you noticed that there are much less new Touhou fangames, doujinshi and doujin music than for example 8 years ago? Have you noticed that a lot of new fan content is nearly unnoticed? Have you noticed that fandom is not united and split? Have you noticed that last Touhou games are rushed and story is less well-written?
Opening with a bunch of fearmongering is great! Citation needed for literally every single point here. Last point is subjective.
The fandom is divided in small little circles and cliques which rarely interact with each other. And each of them has its own vision of Touhou
Why is this bad? Why does there have to be a unified hivemind community?
The fact that there is so much diversity in the community is a
strength, NOT a weakness as this implies.
The fandom knows nearly nothing about itself.
This section of the post is just a general outcome of moving things to closed platforms like Facebook/Discord/Twitter/Bilibili/whatever instead of using open platforms like forums. So use forums more if this concerns you. (I'm doing my part here).
a commercial franchise based on doujin games.
Probably the only section of that post that has a fair point. Nothing to say here other than I believe the doujin spirit is still there for ZUN, but he delegates too much to other people. He's stated before he hates dealing with legal matters, but it's an unavoidable thing you have to deal with once your franchise gets big.
Len'en Project
Funny for the OP to mention Len'en when Jynx has literally overworked himself into health problems working on the series. What is being advocated for here?
we are sinking in the same boat (no matter you like it or not).
This sums up my overall feeling about this post, which is that it is 1) overly pessimistic and alarmist, and 2) does not provide any realistic actionable steps.
In the end, it's "just" a whimsical series about magical girls shooting bullets. I love Touhou with all my heart but honestly the people concern-posting here need to go touch grass.
The only takeaway from that post is something that has guided Touhou fans for the past 20 years or more: If you want to see something, make it. It's that simple.