There are blown calls in almost every sport: baseball, soccer, basketball, boxing, tennis, etc. It happens all the time, even to the best experienced refs. After all they are all humans (unless you want them to stop the clock 10,000 times to watch replays). I don't see the big deal, unless the incompetency is too obvious to ignore. However, most of the time (90%-95%) the calls are probably fair.
Now we have all kind of instant replays in sports (in my opinion, replays should be used only in games that matter). I watched the game yesterday and witnessed all the media "circus". The Packers did not lose the game on that last play. If you want to win a game, you have to win it convincinly. Otherwise you are exposed to close calls and/or bad fortune. That goes to any team and can go either way.
I personally don't think (as many of the ESPN commentors said yesterday) that the game is suffering because of this. I can only agree if there is a safety issue and players are being hurt. Or if you think that the refs are "sold" and favoring a specific team.
I don't see any of the "winning teams or players" complaining...Only the losers.
By the way, I think that the ESPN commentators after the game last night were very wrong (excuse Mr. Steve Young. Your emotions took over a rational and objective assessment of the matter - Hopefully you did not have any money on this game). I even think that the Packers handled the situation very professionally during the after-game interview: yes, very pissed off, but not commenting on the calls.