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.)