It's an interesting question. I have not seen any studies yet that indicated what the factors were on that quite dramatic shift of voter opinion, which came very close to endorsing it, even at the super-majority threshold set in the legislation, in 2005, and quite soundly rejected it in 2009.
There were a lot of factors at play. The economy was different, the balance in the House was different, the proponent and opponent groups were active, and there was a lot of TV advertising being done by the opponent groups. I'm not sure which factor was the most dominant one, but my office did make sure that the maps showing the difference between 85 single-member districts and 20 multi-member districts that would still return 85 members total were available to everybody. There was a household flyer, sent to every household in the province, that showed those maps.
So it will be very interesting to see what the factor was that caused this dramatic shift, but I'm not aware of any of those studies being published yet.