Wikipedia is a non-profit that exists for the betterment mankind. It already embodies the spirit of the fediverse, and has before the fediverse had existed as a concept. There's no reason to burn it down for the sake of rebuilding it. Not to mention that Elon would do so much damage in the time it takes to get a working site off of the ground.
It's created from publicly created content, which is great and was a revolutionary move. It embodies not just the fediverse ideal, but the original purpose the internet itself. I use it almost daily and I even make a small monthly monetary contribution to keep it going. But, afaik, it's still centrally hosted and managed. All I'm saying is decentralize it so that Musk has nothing to "buy" or whatever he's trying to do.