The great thing about this essay is that it is focused and we can all agree that it is addressing an important practical problem and its potential solution which can contribute to humanity's steering. That said, it does not address the question posed directly.
Supposing you could somehow fix the peer-review process in academia, would that solve the problem of steering the future? Is there a lack of scientific consensus which is the main reason for big problems facing humanity? Or are we imagining that "open peer review" will somehow translate to social and political consensus - and action?
Also, I think the most telling lines of the essay are these:
"How do you let anyone have their say while still maintaining an orderly process and arriving at an unbiased conclusion?
The answer to that is not yet clear..."
If I were intending to be completely snarky I would leave it at that, but the essay continues:
...but there is hope that letting anyone have their say is not necessarily a recipe for disaster. Wikipedia is a good example of a system that allows anyone to contribute."
I address this also in my essay; the experience of Wikipedia has shown that, in fact, in order to maintain order it is necessary to have a hidden if not invisible clique of editors who exercise power over ordinary participants. Also, Wikipedia is not making decisions for steering humanity. Users go to it because they find it useful. On controversial issues, it aims for a balanced and reasonably comprehensive presentation of views, so partisans have no real incentive to opt out, which would only mean no representation at all.
Also, Wikipedia is not a completely convergent process. If you don't like what's on one page about your topic, you can invent a new one that frames it differently; then maybe you will have to fight off an attempt to merge, but you might win something in that battle.
But you are right that another key to making Wiki work is the establishment of rules and conventions. The seemingly rigid and (relative to other web content) impoverished presentation is actually very important. These are features that can work in open peer-review within academic communities with a shared interest in the advancement of knowledge, but it is less clear that it solves the problem of steering humanity where interests and strongly held viewpoints conflict and battles are fought often violently.