The thing is that in 1 year or so, your gear will cost less than "-20%". This 20% is true for CaNikSony, but not for a dead system.
They say that your camera will work for a many years. And they're right, it will. But how about service? How about buying something new? There will be no new lenses, no new flashes, no accessories from 3rd party vendors. Even now it's not that simple to make NX camera work with, say Yongnuo syncs.
Sure, one shall not consider camera as "investment", but any camera or lens has it's price, and, for example, I sell my old camera to buy new one, and usually it is over 50% of new camera's value.
I don't know how the things go in US or Europe, but in my country it's pretty hard to sell NX gear, especially expensive one. And things will go even worse in a year.
I decided to sell NX gear and don't regret about that. Sure, it was great to use, but I need some confidence in future of the system.