The Open only proposal did form part of an investigation, yes. That the investigation was clearly stated not to be a fait accompli rather suggests that there are no guarantees as to the outcome, and Will's follow-up post mentioned that some of the proposals in the Flash Topics were being considered, i.e. not all of the proposals.
But this came from them- it was FD saying in hindsight Powerplay was seen as more PvP like, them suggesting Open only. While they did say some, if you take away Open from that proposal (which was incredibly light to begin with) you also take away uncapped UM, fortification directions and are left with....votes on votes, weighting and...no new gameplay- at all.