The structure to link relevant content is already there. Same with the site's search engine. I work with namespaces, titles and content and local search does the job.

The issue at hand (and to answer your question) is that this mouseover menu doesn't add value. It moves attention to popular content - not must read content. Google claims to know what the next page should be, I claim to already have that functionality. And it doesn't involve likes, votes, +1s, keywords, tags or ranks - it's about original and relevant content.