I'm currently doing YC Start Up School with a company set out to help solve the problems mentioned in the article and other related ones, for work teams.
Besides making it easy for every invited member to submit and compare alternatives, it allows teams focus discussions by structuring decisions in a visual, clear way (weighted pros & cons, multiple weighted decision criteria, etc.), contrast opinions of different contributors and manage a configurable the process to drive engagement.
I hadn't heard of the concept of "premortems" but the decision structures are flexible so any decision could be configured to support them (either one "premortem" per alternative or one per alternative/participant pair).
If anyone is interested in a demo of Resolutt, please let me know.