The way the site's content is stored can be a problem. But the even bigger problem is making the site functional for anyone. All information must be accessible within seconds, for anyone who enters the site. No need for downloads or other extra programs to access.
I believe the OP meant the "decentralized storage" as a backup solution, not as an actual proposal to move Bitcointalk entirely to a decentralized platform.
I think you missed the point in my opinion and I don't think that it's all about moving Bitcointalk forum rather it's all about having a backup or copy of the bitcointalk forum if you ask me and store it in another site where you can access it anytime you want by using the search function in the platform if a person wants to check a certain information. If I understand or get the point and that I am not wrong then it should be similar to bitcointalk forum or maybe not except there is no post feature means we cannot post in the site and we can only add new information (if there's a feature to manually add something) if there are new posts/information posted on bitcointalk forum or automatically added on the site/platform which I can say that it is archive site/platform that looks like bitcointalk forum or not or maybe the same as what TryNinja have created
https://ninjastic.space/topic/5499856.0But copies of the forum already exist! He gave the example of the TryNinja website, and even LoyceV does the same.
And I think anyone can do the same. I remember seeing that someone had a mirror forum, where it was visually the same but you couldn't post.