This may not be a popular opinion but I'm sorry to see this happening. And why did they wait so long to do it? Why not file the complaint immediately after the competition? This will set a precedent and every time a skating federation thinks their skater was judged unfairly they'll file a complaint. In my mind it would be better to "fix" the judging panel and how they're chosen (if that is indeed an issue) and just move on. Yuna has moved on!!! It's over.
Not an unpopular opinion with me, noskates; I totally agree! While we (that is, the ISU) can tweak the scoring system to its heart's content, and perhaps judge selection can be improved, figure skating by its very nature will always have a subjective element to its appreciation and judging. Therefore, what you predict about every federation following this lead every time they are disappointed, would certainly develop, and ultimately be much worse for the sport than occasional controversial placements.
I think of 2 asides, also. #1, just a personal observation---although I was never a big Plushenko fan to begin with, my opinion of him, more personally than as a skater, took a steady downward path, the more he ranted and carried on about the 2010 Olympic result. Though I also thought he was wrong, that wasn't even the point in my mind---I just couldn't stand how loudly dismissive and ungracious he continued to be over time. I think Yuna is handling her situation in a much better manner thus far.
#2: I have to just wonder if the timing of the Korean filing has anything to do with world politics at the moment. By its actions in Ukraine, Russia has managed to stir up and alienate most of the world, so it seems that a protest which might involve allegations of Russian corruption might be especially welcomed by a world unhappy with Russia anyway just now. Just a thought off the top of my head.