It means they inspired a journalist to write an irrational dosage of Fear, Uncertainty, and Doubt!
Your camera and lenses won't stop working because Nikon has a bad sales year. Your gear will keep depreciating as usual. Remember, most cameras are not "investments". They are SUNK COSTS. Only a handful of collectables you wouldn't want to use will appreciate in value. USE 'EM (Nikons) IF YA GOT 'EM.
It means Nikon wasted about ten years getting serious about high end mirrorless camera technology.
It means Sony, Fujifilm, Panasonic, and Olympus *have been* serious about mirrorless camera technology. Nikon (and Canon) are playing catch-up.
It means that smartphones have replaced MOST peoples' "need" or "want" to carry a dSLR, let alone a point-and-shoot camera. Let's see, a light weight, pocketable device that does any of two million different things, from anywhere, vs. a bulky camera that has to be carried in a separate case and worried about being stolen... Which does Joe or Jane Public generally want to carry?
For over 50 years, PMAI (the now defunct Photo Marketing Association International) held an annual convention. It was a mecca of all things photographic — buyers, sellers, wholesalers, retailers, and some users attended it. I went to one in the late 1990s as an industry insider, along with over 42,000 people from all over the world. I went to seven of them, my last one in 2010. Attendance was WAY off — down to about half its peak. Two years later, the event was co-located with the Consumer Electronics Show, and a few years later, the organization died. Paradigm shifts happen quickly!
Seriously, I wouldn't worry a lot about Nikon. Paralleling the death of PMAI, camera sales have gone to hell since 2005 or so. Yet there are more high quality/high end, full-featured camera models available now than then. The companies making them just aren't selling as many. They will "right-size" their operations to survive. Some may merge. Rumors will abound... Has it really ever been any different?