I agree. 

Frankly, there is essentailly zero change that PS5 launches in early 2019.  That would mean 15-19 months from now.  But, there hasn't even been a credible rumor, a leaked photo, or anything else to indicate that Sony has something coming that soon.  Also, nobody launches systems early in the year, unless they're forced to do so by the failure of a previous product (ie, Nintendo), or are late delivering a system that was intended for the previous fall.  Sony is definitely not in either of those situations.  So, even if it was going to be a 2019 launch, it would be late in the year.  

From another angle - Sony has no reason to want to rush into the next generation.  They have huge market share right now.  Moving on to the next generation just opens up the field for MS or Nintendo to take a bigger chunk.  Sony will ride out the PS4 as far as they can.  They have a huge install base, so they can rake in the cash with software sales.  

Frankly, I wouldn't be surprised to hear of another PS4 upgrade.  That keeps the market share intact, but still allows for people to upgrade if they want.  

They are in a great position, but I don't think Sony would want to jump to a new system especially when the PS4 doesn't look to be slowing down anytime soon

I feel that it is going to be Oct/Nov 2020, but it is possible for 2019.
Going on previous generation lengths then it will not be before late 2019, however, Sony like to maximise generation lengths, so if they believe PS4 still has great momentum they may not release until after 2020.

1. Sony has no need to release a new console antime soon. They are by far the market leader, the PS4 is still selling extremly strong and its highly doubtable the One X could get any significant market share (to expensive, 4k is to irrelevant in the mainstream).

2. Sony is currently building on VR. Just launched 1 year ago, they will want to make sure to get a significant market share here before jumping to the next console. The PSVR has the price of a full console, they wont made it obsolete within 2,5 years and they wont make it compatible to the ps5 either (but make a full new VR headset, wireless, inside/out tracking, new controllers, no light tracking , no camera and so on).

3. Future consoles will most likely not be about 4k/60 but about VR anyway. Sony is currently using their market share of the ps4 to help jump start this technology (as seen with the PSVR sucess (=so far ~2 mio sold)) its still not as easy as expected. The One X cant even do that currently, so I cant see sony getting nervous. 

4. The One X does nothing a current pc cant do. If 4k would be as important and some people think, sony would have already troubles because of high end pcs. This is not the case.

5. The One X is also way to expensive to hurt the ps4 (200$) or even ps4 pro (350$). A gaming console @500$ wont effect the ps4 sales at all. 

I expect the PS5 to be released in 2021 or 2022 alongside the PSVR 2. Many people will have tried VR by then and so will be excited about it and the technology will be matured and affordable. 

That's why I'm expecting them to release later, like I stated in my first post in this thread. 

"And by the way, I'm not convinced that the jump from the current PS4 to an hypothetical PS5 with the power of a GTX 1080 will be enough, much less compared to a PS4Pro."

How so? Why wouldn't a GTX 1080 equivalent be enough and enough for what?

Because of diminishing returns. We've reached a situation where graphical improvements are so hard to see, that it takes a lot of power difference to make it noticeable.

A PS5 with the capacity of a GTX 1080 would only be able to show PS4 graphics at real 4K, but beyond that, you would hardly notice the difference between both consoles at Full HD.

I'll add to this a couple of things:

1. There's no reason to come so early when they have a console which is selling like hot cakes and not having something special to really differentiate it from the PS4 (Pro). So unless the PS4 drops much harder than the Wii ever did next year there's simply no reason yet to bring a console that early.

2. 2019 with 4k@60FPS? 2 Problems with that: a) That would be very expensive at that point of time. Like, over PS3 launch price expensive to realise. Sony would need to heavily subvention the price again to sell that console at that point of time. b) Getting that amount of power cooled in a console case. It would need AT LEAST some Vega 64 power and a decent Ryzen processor, which atm take about 400W combined, twice as much as a console can work with. Even with 7nm I don't see the gain substancial enough to make that work at that point of time. c) Such a chip would have about 500 mm² in 7nm, about twice as big as the one in the PS4 (in 28nm) and PS4 Pro (in 14nm). Since the price of chips rises exponantially with their size, that chip alone would be pretty expensive to produce.

It's a fake, and a shitty one at that.

Having that k hanging below Desktop/Notebook is already a giveaway, but that thing that makes it a fake for sure is that it also claims Bristol Ridge has a Polaris GPU part. Instead, it only uses GCN3 (like Hawaii), not the GCN4 like Polaris does. Also, AMD doesn't use CU's, instead taling about NCU (without the 's)or just Compute Units. Lastly, they would certainly say that Pinnacle Ridge would have improved Zen Cores, not simply Summit Ridge Architecture.

Isn't that what people said about PS360 to PS4/One? That really isn't a compelling argument. 

Alright, and how do you prove this? What constitutes to being 'noticeable'?

I don't doubt you, but I'd like to see a source for this.

That's an interesting theory, but if people are expecting 4k/60 with every game on the next gen consoles, they're gonna be highly disappointed. I'm expecting late 2019 still. I also believe MS will drop everything they're doing to counter it, no matter if X1X is successful for them or not. MS seems interested in fighting a hardware arms race, since developing games seems to have gone to the back burner. They will switch to the phone model if they have to.