Allow the Wiki link to point to external Wikis.
Allow the wiki link to be repointed to another source, like SharePoint, or VSTS.
Too many wiki sources and information becomes a pain to hunt down, resulting in lost information.
You can just remove the wiki tab, and add a new tab that points to the external wiki, and call it Wiki
This is a request to replace the existing link, not just embed a new link into the body of the wiki.