People keep saying Kim's injury isn't that serious. It isn't serious in the context of being life-threatening, but when it comes to quality of life, it can be very serious. I have known people who've suffered with severe back pain due to slipped and/or ruptured disks, and believe me their activities are extremely limited, and they do not enjoy their lives.
Kim's injury isn't quite that bad---right now. But if she is forced to compete before this current flare-up subsides, it could potentially get worse.
I have read that Emily Hughes has said she is glad that she doesn't compete for South Korea. I'd bet many other skaters feel the same way. It's a sad commentary when a skater's personal health and well-being has to take a back seat to the prestige of her federation.