I dont necessarily think there is any clear cut rigging. I do think the four Canadian teams that lost the cup in 7 games were good enough to win and quite possibly good enough to win in fewer than 7 games. I dont include Ottawa in the conversation because they were wiped out quickly by an obviously stronger Ducks team.
As for the four Game 7 cup losers, I for one dont think anybody could say that officiating didn't play a noticeable role in the outcomes of those series. That's not to say that the winners are predetermined indefinitely, what I think is that the on-ice officials are instructed by Bettman or one of his cronies to tilt the ice in favor of the league's preferred team without being terribly blatant about it. This has resulted in 4 Final series' which have gone the entire distance with all but the 2011 Canucks losing the cup by 1 goal.
I think it's very safe to say that Bettman and the NHL are more pleased to have the Rangers, Lightning, Hurricanes, and Bruins win Stanley Cups over any Canadian team. Two original 6, Two sunbelt, who better to win at the expense of the teams from Canada.
I dont think it is impossible for a Canadian team to win a championship, I just think that the Canadian team will need to be noticeably stronger than their opposition in order to overcome them and the officials. Again I'm not saying that there is any true fix, but Bettman himself does speak of "game management", why not series management as well? The officials do have the ability to give the league's preferred team a helping hand, one example that we've all seen was the Canucks quarterfinal against Chicago in 2011, not to mention last year against San Jose as well. Although if the referees were trying to hide their bias in that series they failed miserably, that was ridiculous.
Speaking of the on-ice officials, does anyone else find it a little suspicious that they seemingly dont have to be held accountable for their actions? They dont have to be questioned by the media after games, players almost never point the finger at them when their team gets jobbed, they dont get suspended when they clearly appear to be incompetent, and if a coach or GM questions or says any ill word about them then Bettman slaps said coach or GM with a hefty fine.
It all seems a bit shady to me.