This entire debacle is a big missed opportunity for Nikon.
In the end, they’re having to do what should have been done in the first place anyway, but now it’s perceived as a negative, with them grudgingly providing customer support because they’ve been forced into it, and every time someone reads a story about it, it reminds them of the negativity.
Had they been proactive, and as soon as the issue was discovered, offered free maintenance/replacement/upgrading to all D600 owners, it would have been less costly for them, and great for their PR image.

Started out doing photography at the age of 6 using an uncle's old 1940 kodak brownie box camera. At 15 years of age, I decided to buy my very own 1975 Praktica SLR camera. I now shoot with a Nikon D850. I do unpaid TFP and commercial paid work.