I think the idea is that, as time goes on, the community should approach a consensus that should become visible, via up votes and commentary.

In reality, the majority of subjects that are the domain of the Meta site aren't really so contentious that I'd expect this to be a problem, though that may be naiveté speaking, my gut says that most of the issues that will be resolved here are more about discussing and defining the fine edges of broad concepts that are already pretty well established across other SE sites, and via the FAQ in progress.