A few years back i came with an idea, I know wikimedia is not fond of "advertisements" but what if we advertise wikipedia? There is a nice big EMPTY space on the bottom left side of wikipedia.
Make a script/feature/extension which detects the person browsing the wiki's IP and shows them a link to their country's wiki (disabled for logged in users)....so for example if it detects the ip is from Fiji, there will be a small advert on the left of whatever page in their vernacular language welcoming them and asking them if they want to be part of Wikipedia Fiji with a direct link to that language wikipedia's main page...Google and other sites use similar methods to filter their adverts so why not use this in a better way?
Most people are not aware of the existence of certain language wikis and most users for whom English isn't a first language may prefer to read article in a language they understand...