We don't have enough coordination to implement (1) or (2). (3) is going to happen, but we can mitigate the bias by keeping in mind that consensus we see may be fake (and how much it might be fake). There's still the problem of potentially worthwhile opinions never coming to our attention. Maybe if your real opinion is worthwhile, you should use a sock puppet account to post it? (Email addresses are easy to get).

On the other hand, maybe you expect to lose epistemic credibility for your real opinion because it is actually not worthwhile, in which case encouraging you to post it on a sock puppet account is a bad idea. Maybe there should be a "secret opinions thread" where people posted what they really believed with sock puppet accounts. Or we could just use another site like Reddit.