Note that Nvidia has an event coming up on September 1 where the company is expected to announce its next-generation cards (either 30x0 or 21x0 series).
https://www.nvidia.com/en-us/geforce/special-event/
Those should bring the cost of 2080 Ti-level performance down, as well as boosting top-end performance.
AMD is also supposed to be introducing their next-gen "Big Navi" cards in the November timeframe, and these are rumored to be more competitive performance-wise with high-end Nvidia cards than AMD's current cards. If that's true, then we could also see some price competition coming into play, something Nvidia hasn't had to deal with for a while.