I can't talk for others, but the 2012 disappointment was less than a year ago. Our win over Geelong was 5 years ago, you'd think they'd be able to handle it better seeing as they stole the 2009 GF from St.Kilda with questionable umpiring decisions, and in 2011 Collingwood and Hawthorn beat the crap out of each other the week before. These guys are not invincible, far from it. As a matter of fact I don't think they'll even make the GF.
For the record, whereas I was disappointed to lose the 2012 GF, I have no axe to grind with Sydney because they beat us. My only problem with Sydney is how they are given advantages over other clubs in the salary cap. I can't see myself carrying on like an idiot in 5 years' time about Sydney ... unless the AFL continue to favour them in this fashion.