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An SMT would allow for users to grow a stake in the community, but not exercise any ownership of the community. The user who made the community has the sole power of ownership. IE they can create admins, mods, mute people, etc. They could change the whole nature of the community if they wanted, or for whatever reason tank it by muting everyone.

If the community did have an SMT, and people had invested in it, I wonder if that's a bit too big of a central point of failure.

Yes you are right.

But there is a VERY SIMPLE alternative.

If the owner account or management do not share the same value as the community (stake weighted? one account one vote? whatever other system), a new community can be created and everyone who agrees with its principles moves into the new community. There is the possibility to share the owner key between multiple members - that's already better than having one owner.

If the old management has no support, the old community will be dead.

I think that's fine, but the only thing would be if there was a community token as well and people had bought it. It would be associated with a particular community. I know I'm just inventing Black Mirror scenarios at this point, but yea, that's where my head went.