Sure, just like majority of smartphone users can't afford iPhones or the vast majority of GPU consumers can't afford 980 tis.
The point isn't that the LG OLEDs are the only TV that anyone can buy, the point is that if you are buying a Tv and you really care about picture quality the LG OLED is in a category by itself when it comes to quality. Much like the iPhone or the 980 ti.
There is always room in the market for people who don't care as much and just want a moving picture screen to keep the kids happy. That doesn't change what the high-end is.
Sales-wise, no they aren't dominating because of the cost. The "cheap" 1080p OLED is twice what a 4K LED of the same size can cost.
If we are talking about product quality via picture quality, I would argue that right now the LG OLED dominates the TV market more than any other product line dominates any other market in technology. The measurable picture quality (as defined by the most important metric of contrast ratio) is magnitudes better than anything else on the market. If the LG OLED was a CPU it would be a 6700K and all the LED tvs would be AMD Turions. If the LG was a GPU it would be a 980 ti and all the LED tvs would be GT 210s. OLED technology makes a huge huge difference.
I'm not disagreeing with you on the picture quality, just on your choice of analogy. The LG OLED is in a class by itself, but that class is still niche due to the cost. The TV market as a whole is still quite varied, and there's options of different manufacturers throughout most price brackets. Unlike LED vs OLED, the vast majority of people in the CPU sector are choosing Intel. If the TV market were the CPU market, LG would be selling 4k and 1080p LEDs and OLEDs, while the other brands were limited to cheap 720p Plasma sets the heat up your whole room.