There is a misassesment of the situation on the part of users wanting www.wikipedia.org/wiki/Article to be an interwiki disambiguation. You think that www subdomain would be an ''official'' wikipedia URL that somehow rests symbolically above any of the de, en, es or other language subdomains - hence, your refusal to accept the ''official'' subdomain to be subordinated to the english portion of wikipedia.
But www is not an official URL anymore. www is an archival URL! This is because nowhere in wikipedia.org does the MediaWiki software produce links in the form of www.wikipedia.org, but they will always be langdomain.wikipedia.org Search for it. www is a cruft from the english+deutsch dual wikipedia era, and serves those few hundred (thousand?) links made to WP in that specific period of time (if I read correctly the discussion so far) NO ONE links to www today, because simply there isn't a way to get to that address. Type it, and it hard-forwards you to the en. domain - the browser will not let you copy+paste the www URL to your web editor.
If you really wanted an interlanguage disambig, (is this really needed, or is this just a filler-up for the imaginedly existing www official subdomain? ), then the best solution would be creating another subdomain for that purpose - of course, the ideological problem remains - should the menu for that MediaWiki installation be in english? how can it be multilingual? But I think such attempt is unnecessary.
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On a separate note, IF the idea of pushing for interlanguage www subdomains came forward, I would strongly advice against "intelligent" language pickers based on predefiner browser settings, IP geography, OS regional settings or otherwise - a large population of internet users are not monolingual, and we link specific language versions of wikipedia (using del.icio.us for example) for a specific purpose. (Different content! Different audience!)
Yongho