Yes Titan V is way expensive, there is no geforce Volta coming period, Volta is older and superseded by Turing, Turing is what replaces it and is based on Volta design for the raster and AI side. Turing also has the additional dedicated ray tracing elements, AI/Tensor cores are also based on Volta but cut down and somewhat refined to suit the RTX feature set.
Titan V being so expensive and different in it's raster architecture is why almost nothing is optimized for it. My point is that Turing shares Volta design so it will more than likely need some optimizing for to get the best out of it, it's not just a bigger pascal/maxwell.
It's raw FPU count and speeds are not that much more than pascal, far less than Titan V in fact. So the gains are mainly in the architectural changes, how much game engine optimization is need is my question and more directly is that applicable to SE?