We manage with images. As long as you have a few people who never stop thinking about copyright it can be done.
Do we? All images have to be released under the GFDL, or something compatible with it (ie. lets you do everything the GFDL lets you do, and more - hardly comparable to some parts of a site being under a NC license, and the rest under GFDL). (NB: Fair use is not a license.)