I hate to blame Sportsnet only, but they were a big reason I myself stopped paying attention to other teams/games.
I actually liked all the commentators they had besides one before SN took over full time, but watching coverage after the change infuriated me, as they wouldn't call action on the ice, instead focus on the "Stories behind the game." I was personally never a fan of the CBC/SN intermission crew, but to each their own. Don Cherry is fine, he's just Don Cherry right now, the broadcast would feel weird without him. Strombo is so missused it's criminal. His feature interviews go over so well with me, but him leading a panel just isn't clicking right now. Maybe he'll grow into it, but I'm not a huge fan of the format they're using right now. I'd prefer to see different panel's each week.
The big "plug a glass puck" computer made me change the channel so fast, and I haven't turned back in a while.
I sometimes purposefully miss jets games because I don't like their coverage.
I don't think it would really matter if they were capturing the more casual audience, but I they may have lost some of the hardcore's with their current broadcast setup, especially if most of your favorite team's games are on a different channel.
Oh well, only 15 more years of no competition. :'(