the card is well within reach for the rumored 1060 in terms of performance, with the potential to use a huge amount less power (like probably sub 100W TDP, considering the GP104 huge efficiency lead over everything else), still I can't feel to disappointing, you have to look at where AMD was until, it's a solid improvement, compare the efficiency to the 380 and 390.... more or less 970 perf (+ no vram issues and better DX12) for 970 power draw for $200.
now if Nvidia decides to go aggressive with the 1060 pricing... well...
good thing is, the 970 was $329, the 1070 $399 (+ founders edition), if they follow this with the 1060... the 960 was $200, 1060 = ??