This happens in so many industries... A company shifts its manufacturing to a new country where labour costs are much lower, other companies follow suit and so demand for that country's labour grows, that labour eventually becomes too expensive and the manufacturing shifts to a different country... and so on, and so on.
I fondly remember a time when Japanese guitars were positively cheap compared to USA and European instruments. As a teenager, I owned a Tokai Telecaster that was every bit as good as Fender's original sonically, played beautifully and was superbly built - but was a fraction of the price. Now, Japanese luthiery is in such demand that prices aren't far behind USA-made instruments, and "classic" Japanese guitars like that Tokai Tele fetch a
lot more than I paid 35 years ago... I wish I'd kept it
No matter where Nikon or any of the other companies move their manufacturing to, the facilities will be set up, staff trained, and quality monitored to the same high standards...