@Akixkisu In my years in the community, I've always seen the rules and guidelines as being able to change with how the community sees them. If the feeling on that policy changes, and there is movement to repel the policy, well then, it will be changed. Except if the policy would literally break the site, like if a policy was that every answer had now to be a joke answer
So to wrap: there are 2 things that are necessary for a policy change: A community consensus on the thing, and, where the mods come in is making sure that the policy is not dangerous to the health of the site, but even then it should not be a 1 mod going against the grain, it would be probably a mod consensus that 'X policy must not be enacted, because it would screw with how the site works'