It's not really difficult to feed in a large file into some sort of a stream editor. The main thing I think will help the wiki upkeep is some method of automatic the unit stat updates, since we (human users) have to do this individually - and AFAIK Diazo also did it individually. His automation was converting the big file into a copy-pastable text formatted for the wiki.
One could set up bots or do some Perl magic, although I imagine it'll be the admins/devs who will run them when a patch note changes the unit stats. This way, no one has to take care of the data itself (when the bugs have been ironed out) and volunteers can worry about updating the topics.
http://www.mediawiki.org/wiki/APIhttp://www.mediawiki.org/wiki/Perlhttp://www.gossamer-threads.com/lists/wiki/mediawiki/190367= = = =
The other problem we'd bump into is finding the right context to make the images and videos, regardless of tutorial. Real games are usually filled with clutter that's not really to the point, so without a toolset we can't easily recreate things like the lone sad leech starship bumping against a Mil-I under a shield bubble.
I think people will generally manage though, they don't have to be the neatest tutorials in the world.
NB: I presume there's no inherent risk with uploading a save file for download on the wiki?