Is the forum decentralized? No, it is not! Is Bitcoin truly decentralized? Do define democracy by the way as this forum is not.
Where is the technology to do that (decentralized forum)?
Will you make a blockchain forum? Would you pay a transaction fee to post?
Would you run a node for free?
Who is going to create a fucking front end with capable SEO to compete with bitcointalk, for free?
We have hundreds, thousands of forums in the internet. This is among the best of them. I don't think there is much to change here.
It is a challenge but it can be done if we as a community can work on it. Why are you concerned about SEO? This is where I surrender as the SEO part is so much destroyed as Reddit stands out when typing anything related to understanding Bitcoin or its issues. What you said is another excuse as the community is still progressing with mouth recommendations or due to the reason that the forum does not provide good informative post anymore.