Would not be surprised to see a fairly early price cut.....
You won't see any movement in price until at least well in to Q1 2019, Nvidia now has all the arrogance and swagger of Apple & Nintendo, price cuts would be seen as demeaning, an admission of failure and damaging to the brand.
Nvidia, like Apple & Nintendo have huge cash reserves, they'll sit it out until they're ready with a die shrink this time next year.
And If I were AMD, I'd ignore the Ray Tracing path and bring out 7nm cards that trounce the 2070 & 2080 in traditional raster graphics for $100 less, that will get them back in the game, and then the 800lb gorilla of Intel enters the market in 2020.