Oh wow, a non scientific poll taken of a few hundred hardcore fans at a Trek con three months after the movie came out? What a shocker! ;)
The merits, (or lack thereof) of STID aside, the deck was pretty stacked against it in this scenario. It's like putting all of us in a room to rank the prequels. It's a foregone conclusion.
That article trying to spin it into meaning trouble for Episode VII is a stretch, since the STID scriptwriters aren't involved.