Well, you have one part right: it won’t disappear magically. If it does, it will do so quite naturally, unless someone actively preserves it, e.g. by archiving the chat histories.

Of course, you might mean the people with the knowledge that wrote those histories in the first place. You know, the people that used Discord instead of forums. The people that left forums. The people that apparently didn’t want to use forums.

Why would you assume they’d move to forums? Clearly there was some reason they chose to use Discord, so why wouldn’t they just find a replacement?

Discord isn’t the issue. I mean, Discord has plenty of issues, but this particular one is a cultural one. Unless we find a way to entice people back to forums (or some other publically indexable platform), they’ll just keep going elsewhere.

So maybe instead of condemning Discord we should ask “Why do people prefer it?” Then we can figure out how to address that and actually do something about the root of the issue.