> This is a terrible idea. You're destroying institutional knowledge because "it's cluttered."
It's also a terrible idea because, depending on the type of company and its lifestage, it might also be a colossal waste of time and energy even assuming wiki-rot is a problem you actually have (and that it's causing any damage which, honestly, is a moot point for many companies).
Are you really telling me, and especially now, with revenue down in the middle of a global pandemic and economic crisis, that the best use of everybody's time is to trash our internal wiki and start it again rather than, oh, I don't know, work on projects that we can actually charge people money for?
What I need most, right now, is for everyone to focus on making it raaaaaaaaaaaaiiiiin. That's not likely to change anytime soon, especially if the economy takes a protracted period to bounce back, as seems likely.
More generally I tend to be sceptical of people whose main output is corporate busywork[0]. If there's one thing any kind of recession makes clear it's this: the people you want are the people who either make a valuable product or offer a valuable service that can be sold, and the people who can effectively market and sell those products or services. Everything else is ancillary and, whilst you might need it, you want to run it as lean as possible. This isn't about being ruthlessly mercenary: it's about building a sustainable business with a decent buffer of cash that allows you to ride out the rough times so you can afford and keep paying people rather than be forced to make a load of them redundant.
As you've implied, keeping a wiki up to date is a cultural issue, and is something that needs to be done continuously. I think the key here is that sense of active maintenance, and encouraging everybody to be involved. If you change something and that something is referenced in the wiki, you need to change the wiki too otherwise the job isn't done.
[0] I imagine the places where wiki rot is most prevalent are those where creating the wiki in the first place was busywork - some sort of checkbox exercise, or a one off project with no thought given to ongoing maintenance.