Mediawiki has not been developped for manage pistures and others media.
Commons is a wiki software, not a picture managed softaware.
Mediwawiki is not practical to manage so many images.
A new software would be adapted better.
It could managed easily the license, author and others datas wich are attached
with the media.
The categories could be emulate, etc.
We could emulate a wiki with this new softawre, like mediawiki.
The aim of this new soft is better a better classification, better management,
better administration, etc.
Thanks for your ideas