So in other words, stop investing in dx lenses(like the $1300 17-55) and jump ship to mirrorless systems?(fuji, panasonic, sony). Isn't everything going to be mirrorless in the future anyways?
That is exactly what I did. But my prime reason was the fact that Fujinon FX lense range is better built, (slightly) more compact and optically superior to anything DX I have owned or tried. It is just an exiting glass compared to DX, that might be even intentionally dumbed down by Nikon a bit to make customers switch to full frame.
Fuji have no FF plans in the near future, so their top APSC models aim at advanced/pros and FX lenses are built to last and are top notch - to the point where you do not need Zeiss (that is also available with Fuji mount) or anything fancy if you own FX. Fuji makes their own high quality M adaptor, so you can use Leica lenses, or Voigtlander etc. but I am not even interested in that.
IFAIK Nikon earns most of the money from their DX DSLR and as long as they keep doing it, they will not abandon the range, that would be just silly. But I do not believe they have no strategy for the times when mirror less will start taking over DSLR.
The problem for Nikon and Canon is that they can not just use their DF lenses for the new generation of mirrorless, DX will be seen as outdated, cumbersome design with the wrong (yes) flange distance. You will be able to keep using it with an adaptor, for sure and probably even benefit from the price drop on a used market though.
I guess mirrorless is indeed the future, unless there will be something newer that that. As far as I am concerned, it is not a question of "if", it is a question of "when" for both DX and FF. Mirrorless potentially is just a better, more modern and more cost effective technology. You simply can not argue with that, even if for some reason you feel attached to a huge flipping mirror inside your body

. The fact that we still have large, stressed moving parts in a modern digital camera these days is inexplicable. There will be no mirrors, prisms and mechanical shutters in future cameras , that is for sure. FUJI XT-1 has an electronic shutter with the max speed of 1/30,000 sec already by the way.