I think the cheaper LCD offerings success all depends on whether Apple decide to leave off fundamental features like the rumours unfortunately suggest. The rest of the lineup has gotten stupidly expensive and I know from experience consumers have noticed this and have adjusted spending habits in my part of the world.
Fundamental features like 3D touch was never experienced by iPhone 6 holdouts anyway. Coincidence? I think not! Seriously though, let's just wait how Apple will price 2018 models to lure holdouts out of their outdated cave (into a modern cave with animoji).
To add, What I noticed about Apple is that they try to closely match their LCD and OLED screen's calibration to the point where OLED is only better on showing true blacks.