We already have a situation where 28-32" 4K IPS panels cost as much if not more than superior in IQ and larger 4K HDTVs. I like the versatility of a larger screen for a wide variety of media consumption and productivity where the 40-43" size would shine over 24-32" 4K. There is a huge opportunity for HDTV manufacturers to introduce 4K HDTVs with HDR and DP1.4 with 120Hz capability. As long as input lag is kept reasonably in check, PC monitors will have a hard time competing. Those LG OLED HDTVs are out of this world gorgeous that make Acer and Asus 3440x1440 100Hz IPS panels look like 10-year-old tech in terms of IQ.
Wise words. I do think that the saving grace for computer monitors will be low input lag. The TV-as-a-monitor market is quite tiny, even if it is popular in our enthusiast community, we're not representative at all. A TV manufacturer will
always prioritise IQ over input lag, since the vast majority of content is 30 fps. Given how fast-paced eve ncasual games like Rocket League is these days, or 'serious' games Dota 2, having big input lag is a huge no for anyone remotely serious about gaming, which is often a bleeding-edge demographic for expensive monitors.
Still, if the price for a 4K OLED HDR 60 Hz TV falls to reasonably low standards, it could cannabilise some parts of the market. Overall, I am a bit skeptical to how fast the PC monitor market will change. Even today only something like 3% of the entire Steam survey is 1440p or above. Yes, a lot of those people are just on budget laptops, but the percentage still stays in the single digits if we only focus on "real" PCs.
I think you really need a concerted console push to make this happen in the PC space, which might upset the PCMR folks. I think Scorpio/PS4Pro's 4K push is still mostly marketing. The TV market is still overwhelmingly 1080p even if 4K TVs do sell well, it will take several years to truly make a significant dent in the overall stock. We will most likely have to wait until 2020 and beyond for a real jump to 4K native not just as an option, but as the default expectation for gaming as the power of those consoles will simply be too powerful for 1080p. That is also when I expect to see a serious shift to 4K. I'm currently using the ASUA PG279Q. I bought it on last year's black friday and I expect it will be my main monitor for at least 4 years. Hopefully I am wrong and I'll "have" to upgrade sooner if a serious 120 Hz 4K OLED monitor comes out within the next two years for a sub-$799 price, but like you, I don't see that on the cards.