This will never happen, but if it did, the answer is simple. Abandon Wikipedia and make a new one.
Unlike real estate, we will never run out of empty websites to build encyclopedias on. And, unlike a house, once you own a "free encyclopedia", you've invested nothing and can abandon it at any time.
If the world governments want to make a sanitized uneditable copy of Wikipedia, great. Nobody will use it, but it will make them happy. And that's what's great about the Internet.
Unlike real estate, we will never run out of empty websites to build encyclopedias on. And, unlike a house, once you own a "free encyclopedia", you've invested nothing and can abandon it at any time.
If the world governments want to make a sanitized uneditable copy of Wikipedia, great. Nobody will use it, but it will make them happy. And that's what's great about the Internet.