I went from watercooled 980 TI SLI to a single watercooled 1080TI and I don't feel the need for anything more. I play on triple 1440 and so far nothing can make the 1080 ti flinch.
Water is still bettar :P What are people being able to push these things too anyway? I've had mine for like 2 months and still running stock simply because I haven't run into a game it cant handle at 7880x1440.
I went from SLI 980 TI to a single 1080 TI and while in theory I lost a bit of power, games are much smoother overall now with a single card. I play on triple 1440, which is basically double 4k res.
Even playing Destiny 2 at 7880x1440 I had 0 hitches and the game looks amazing. (the open beta)