Wikipedia is dead, for anything other than keeping track of trivia about popular media anyway. All the policies about removing content in the name of improving quality, without adding proper quality processes on top, killed it around 2007 - not coincidentally, that's where the decline of editors started.
The huge knowledge base that is Wikipedia is merely waiting for someone to successfully fork it; it may very well be Google graph, as they're the best positioned.
The first company that manages to define a process to separate spam from good content, and keeps the knowledge clean and growing from all valid contributions through a semi-automated technique, that avoids all the drama over rules and edit warring over content, will be the one to keep all the users. And then it will be instantly bought up by Google, who have been eager for a way to replace Wikipedia for a long time.