That's not a good way to encourage people to buy your products, simply dropping support for software that people have invested money and more importantly a lot of their time into. Good article here on this daft move by Nikon.
Nikon, like so many companies (Apple being the obvious exception), are good at hardware but very poor at software. Worse: Nikon are not only bad at software, they're stupid as well. Their pig-headed approach of neither producing properly-supported raw software nor opening up the format so someone else can do it damages both their users and themselves.
I've seen a number of companies that lock up their IPR (including interface definitions) for fear that opening it up would be "giving away the family silver". But if you don't use it yourself, you're getting no value from it. Give it away, and someone else might benefit - and if it's not your competitors, then so what? It might benefit your users, which expands your own markets.
Technology IPR is a perishable commodity with a very short shelf life. Use it, sell it or even give it away, unless you're sure that givng it away helps your competitors. Nikon don't want to use it, they almost certainly can't sell it without losing control, but they could give it away while keeping control of the format.
My money is that Nikon keeps to the lock-it-away policy. "Just in case." Idiots!