TJ Hooker :
So basically the author failed to recognize an obvious trend in the graphics card market (and technology market it general), that new generations bring increased performance for typically around the same price (or even lower in some cases).
I'm sure you don't need me to tell you that a trend does not necessarily indicate some fundamental law of nature, or even economics.
At this level, Nvidia is running unopposed - and that doesn't look set to change, for a while. So, the logical thing for them to do would be to price it relative to their existing product stack. The only thing we can say is that if it costs more than a 1080 Ti or Titan Xp, it should also perform better. Though, not commensurate with perf/$, since that measure drops off sharply, as you get into the Titan territory.
Back when the 1080 launched, I got a 980 Ti for about $450, which was about the same price as 1070's (its performance equal of the 10-generation). I don't foresee that happening again, since the 1070 had pricing pressure from Fury, whereas the 1080 Ti retains a strong lead over anything from AMD.
The one thing I don't see is them unnecessarily undercutting themselves. Over time, they can drop their prices and slot in new models. Especially as the competition begins to show up.
Something on which I think we can all agree is that Nvidia is very good at maximizing profit margins.