I know I'm totally biased, but that $700 is quite the premium over my current monitor- the Qnix Q2710 Evo II, a 1440p Samsung PLS (IPS) that OC's to 120Hz. Refresh rate and no frame skipping confirmed with UFO test. Mine's been running this for 3+ years. They are now $199 on Newegg.
I'm using it with a 1080 Ti and Fastsync and couldn't be happier. There *may* be a difference between 120 and 165Hz (other than the number, obviously), but for single shooters and such I doubt I'd personally see a difference, and certainly not a 3.5X the price difference. There's definitely a place for 165Hz 1440p; I just think people should know that a 120Hz 1440p with a gorgeous panel can be had for $200.
I'm still waiting for a quality 3440x1440p monitor, 100+ fps, G sync and an IPS panel, but the market still only has a few that meet that criteria: Acer X34 (riddled with QC issues) and the Asus Rog PG348Q with the Transformers stand. I question whether the author's guess that the newest HDR models will cost more than the $1200 asking price of these two monitors is right; this is not new tech anymore and with the lack of choices in this market, I doubt these things have been flying off the shelves.
At least, I HOPE he's wrong.