Wikipedia:Consensus can change
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Wikipedia strives for consensus to build an encyclopedia. Decisions which are made about articles or policies should not be regarded as binding. Later objections to a decision might represent a change in consensus that may need to be taken in account, regardless of whether that earlier decision was made by a poll or other method. In order to reach the best possible decisions, we hold it important to listen carefully to each other's arguments, and to try to find mutually acceptable solutions in conflicts. Polls are the exception and not the rule, and where they do exist they are not binding.
It is the nature of the wiki to be ever-changing. New people visit every day, and through new information and new ideas, we may gain insights we didn't have previously. It is important that there is a way to challenge past decisions, whether they have been reached by poll or consensus. Decisions should therefore practically never be "binding" in the sense that the decision cannot be taken back.