Well bad luck for you , only small amount of TV that using it and it even worse some TV might be using G-sync and some might be using free Sync, I don't see any possibilities for mainstream price 4k TV will add this feature in 5 to 6 years a head. On PC monitors is become mainstream (but with price) , But consoles player usually use TV and rarely using PC monitor. 

I don't know why you say that bad luck for me, but in any case, as I said in my post, neither Sony nor MSoft are scared to launch a console that urges to change/upgrade your TV in order to fully appreciate its capabilities. I don't see why they won't do that again.

As for TVs going with G-Sync or Freesync.... well, HDMI 2.1 is the new standard, while the other two are propietary tech (although Freesync is free and open), so I doubt there'll be much troubles here. Manufactureres will go with HDMI 2.1 and its VRR tech over the others because it will be easier for them.

Both of these were reported to run on Pro hardware. You need to remember ND have never worked on a full Pro project before.

After seeing games like HZD, God of War, Uncharted 4 and Detroit: Become Human, I can't believe people are still doubting Sony's first party studios AND the ps4 capabilities.

History repeated again, when Uncharted 2 and the last of us was announce back then nobody believe it was running on PS3. Also it's not a PC games so it has a lot of trick and technique in there to make it happens. Consoles developer are good at optimization and good at building engine for specific device , especially SONY world wide studios. 

I mean pt II does look like what we would expect from early next gen titles but people said the same about pt I when it was released at the end of the PS3s life, Tomb Raider and GTA V didn't look like they could run on 360 hardware but they did. ND of all people isn't going to do a big E3 showcase for the PS4 and run it on PS5 hardware without acknowledging it lol. This is just the benefits of end of life software (assuming it launches summer/fall 2019).

Have you seen the PS4's sales? Sony are not releasing a console next year. People are jumping ahead of themselves. TLOU just looks amazing, just as GOW shat on everything prior to its release. I don't think a first party has ever shown off next gen software prior to next gen hardware being announced. ND certainly wouldn't do taht without acknowledging it.

Sales have jack all to do with when a company releases a new console. Both the PS1 and PS2 did 20M+ the year before their successors come out. It has more to do with advances in tech and when they feel it's time to move on. Considering there's evidence to suggest that Sony is using an existing Ryzen CPU and are right now working with AMD on a Navi based GPU for the PS5,  and it seems we have all the big exclusive announcements we'll get for the PS4, there's a good shot they may release in 2019. They may also wait til 2020, but that will be the absolute latest. 

When I saw the TLOU 1 for the first time, kind of thought the same and boy did they release the remastered version on PS4. 

You really don't want to release your new console when your old one's sales performance is dropping hard. While the PS4 sold well off the bat (with the exception of Japan), there was a lot of uncertainty surrounding the console market heading into this generation. Neither Sony nor Microsoft would want that kind of thing to happen again.

I will say this. If the technology is ready and the yields are high enough for Sony to release the PS5 in 2019, they'll go for it. Otherwise, Sony will hold off until 2020. Besides, with the likelihood of backwards compatibility with PS4 games, I don't see the harm in releasing the PS5 in 2019 just as long as the specs aren't gimped.