I agree, but that's not self-awareness—that's seeing other people's blind spots, which is much easier, in fact it happens automatically.
You're right that it falls apart at scale. Somehow mass blind spots take over. Can that be mitigated? That is the question.
Group dynamics seem to change qualitatively at each order of magnitude. Maybe the problem of "social media", i.e. internet group dynamics, is that we're dealing with orders of magnitude we've never seen before. That doesn't get worked out in just 10 or 20 years.