There there is hope that PS4 will beat PS2 in sales 😎

Well a new console in 2020 at the price of $400 or $450 will already be outdated by the tech that will be available in the market. So both console manufacturer have to find a sweet spot between GPU generation so that they can bake their own custom solution of future tech in the old outgoing tech.. thats the only way they can hit $400. So by 2020 we will be well into Zen/navi midlife and old architecture will be really old with no new tech on horizon the console will be stuck with navi with no custom solution.. by targeting the launch by 2019 sony can use much cheaper zen/vega and as rumored they can bake in some custom navi feature. until the PS5 pro comes out with full navi gpu by 2021 to compete against xbox two! 

well this just a wishful thinking.

I remember hearing the PS4 was outdated the instant it was released.  Yet, it has sold and is selling massively and making Sony a ton of money.  I don't think they will change strategy for PS5 making it very powerful or $500+ learning lessons from PS3 and PS4.

I think it's already beating it as far as I'm aware. The question is, how long PS4's going to be on the market? PS2 was discontinued after 13 years!

I'm still calling late 2019, but we shall see.

No they wouldn't. MAYBE ~$50 or so. But, that's Sony's strategy for all of their HW, take a small loss and make up for it in SW sales. Remember, the prices you see online for components has the profit margin for 2-3 companies priced in. If you get a card from 3rd party manufacturer, for example, that price includes not only the profit that that 3rd party manufacturer wishes to see, but also the profit AMD wants to see from the chip AND the profit the store receives. Sony buys directly from AMD, which drops the price incredibly. Manufacturers also give nice discounts when companies buy in mass bulk. And considering Some is going to need 10s of millions of these things, they can get chips for an even lower price. 

I really wouldn't mind a 2020 release since I'm in no rush to jump to the next console generation at this point. The PS4 still feels like it has a lot of momentum left, and there are a lot of big games still to come.

Okay. Lets clear up some misconceptions.

Next-Gen tech is mature, it's not overtly difficult to beat the Xbox One/Playstation 4 in regards to GPU capabilities, modern GPU's make the Xbox One/Playstation 4 look positively anemic.

Ryzen has been on the market for over a year.
Mobile Ryzen is using the Zen+ core.

Not even an excuse at this point when AMD is developing it's next Ryzen core.

Whether Sony will opt for an APU really depends on economics, if the chip is going to be rather monolithic, then they might take a thread ripper approach and have multiple chips on the same package as it would reduce costs.

Graphics Core Next is extremely modular all things considered.
You can have a Graphics Core Next 1.0 based GPU with Navi features tacked on... This is the same approach Microsoft and Sony took with their consoles.

That doesn't make it a new architecture, it's still Graphics Core Next, it's just a variant.

Pretty sure I read that AMD has a 61% profit margin on it's Ryzen CPU's, some a little more than that, some a little lower, these semi-custom console chips have a different pricing structure and thus shouldn't be compared to what is on the PC.

But if you think the consoles will get an identical CPU found on the PC/Desktop, then you are kidding yourself, that has never happened in the world of consoles, there is always changes to things like buses, caches and so on.
Even the Original Xbox with it's x86 processor had cutbacks to things like cache in order to cost reduce.

It is not on par with the Xbox One X.
We are entering the second year of the Pro being on the market though.

Evidence?

Uh. No.
The PC gets away with it because it has a plethora of graphics options exposed to the user.
The only Playstation 4 games that will have better fidelity on the Playstation 5 are ones that will be patched... And in the case of games with a dynamic resolution employed... Will run at maximum resolution.

You get what you are given on consoles, that's life.

Would they really though?

Sooner it ends the better though.

Well. If Microsoft/Sony wish to eat some costs, they could build their next gen chips on 12nm instead and quickly drop to 7nm when it's matured.

Still. AMD needs to get it's shit together, not having draw stream binning rasterization and Primitive shading (Available only if you access an API) is a big omission for Vega and forward architectures that I hope doesn't have a flow on effect to next gen.

A 2020 launch makes sense in terms of allowing PS4 to have the spotlight as long as it can, but it also allows XB to potentially compete side by side once again like in 2013. Assuming XB has learned their lesson and has a much stronger launch than XB1, PS may very well want to get a head start with PS5.

Now if PS launches PS5 late 2019, they may lose some PS4 sales because of this, but may also just transfer some of those potential sales to PS5. This would lead me to believe that PS may give PS4 the 2019 holiday, and then announce PS5 early in 2020, say February, with a launch somewhere between then and E3. I would have to assume a late 2019 or early 2020 launch would mean a $450 or $500 price, with it dropping to $400 by holiday 2020 if necessary, to be competitive with the 'XB2' specs or price, if it launches then.

I really think PS should drop Pro and sell a Pro II (PS4k) and end up slightly above XB1X specs. Whether PS just uses the Pro hardware now and shrinks it from 16nm to 12nm but increases the clocks to do it, or uses newer compatible hardware, as long as the price can be $400 to $500, it should sell well enough. It would also give them some indication of how a PS console would sell at a higher price point than $400. Better to find out if it's not going to work now while PS4 is doing so well, then to find out at the PS5 launch.

Another PS4 upgrade soon, would allow PS to sit back and see what XB does. If they decide to launch 'XB2' late 2020, PS should be able to announce PS5 before 'XB2' launches and let gamers know they only have to wait 3 to 6 months for PS5, and that should work out fine for them. Having to wait an entire year would be more risky. If XB waited the full 4 years and went with a late 2021 launch, which would be the latest they would wait, PS could have PS5 ready to launch early 2021 regardless, and if they decide to get it out before "XB2' then great, and if not, just keep quiet and launch it late 2021 as well.

If PS5 were to really launch late 2018, I could only guess that PS has planned on a 5 year gen with no upgrades. There is so much new tech that is here now, just slightly too expensive still, that dragging PS5 and PS5 Pro out from 2018 to 2024, would seem like a misstep to me.

I know some say it will come early cause PS4 come early, but that was necessary due to the start the PS3 had.

There is no reason for PS5 to come out in 2018 as PS4 is selling so strongly. Games sell consoles not 4K native resolution lol,