An additional advantage could be tha ability to cope with new data types. I think of SVG, as an example. The code for including such a file is quite different, but for the user, it would be the same as a jpg ("{{IMG:foobar.svg}}").
Why not just [[Image:foobar.svg]] in the Image namespace? I was wondering how this would apply for the non-English wikipedias, but then I realized they could still just use the old way... (linking by URL)
Chuck
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