During a "breathe out" the access to a wiki is made a little more difficult. For the regulars this will not be a problem. Others will feel repelled or slightly offended and will move on, looking for other communities that fit themselves better. This may be necessary for a successful community which has attracted too many people that are not really interested in the core topics of the community. In general this is a chance for other communities to get new members and a good time to found new communities.
See also WikiLifeCycle