Nikon came out with a replacement some time ago, hoping to dodge the bad reputation of the D600. Toyota just paid a billion plus $ for hiding defects, and GM is going to have to match it.
It seems to be a no brainer to fess up and fix a issue, but the book keepers think they are saving the company money, when they are risking much more.
Every camera has issues, some are minor, some are a real issue. It is a juggling act to decide which falls into which category, but after Nikon was called out in DPR a couple of years back, they should have acted more decisively.