No they can Kill thé brand as long as they do a console liké Switch ( well it would still bé à handheld then ) , beczuse sometimes when i play horizon id liké to take it on thé go , thats thé Switch feeling.

But It wont​ bé Possible to have such portable games before at least 5 years

The problem is:

at 28nm the PS4 uses like 100-112watts (CUH-1200) playing a game.

at 16nm the PS4 uses like 63-86watts (CUH-2000) playing a game.

^ that is waaaay to high for a portable, even at 7nm it would still be too high.

Even if you "keep" the performance the same, atmost you ll probably see a reduction to like half the power of the 16nm chip.

a 31-43watts "portable" at 7nm would not work.

It would need to be like a laptop or something then... lol.

Maybe its possible to lower power-usage other places, HDD, fans, other chips & components.

But I doubt it ll be a sensible design to go for.

surely some changes would br made..... if they drop to 7nm, it would mean a couple of things. First they would downclock the GPU as the portable console wuld only render at 720p max native. They also would not need GDDR5 ram anynore and would instead go for LPDDR4 ram. The also wouldn't use a HDD and put in something like 256GB flash storage and would use a much smaller fan.

Its all possible really but a lot of changes would need to be made, and I doubt that they would think thats worth it for something thats supposed to be the weakest PS sku in a family consisting of the PS4 and PS5.

I have been saying this for a long time now. With Firmware 4.50 on the PS4 they are closing in on a really good OS. By the time they could do this in 2019 or 2020 on 7nm Fabrication, they would have all the tools they need to be very competitive in the mobile space.

With the way Xperia is sinking, I think it would be extreamly wise for Sony to bring all of its mobile patents, and mobile developers into SIE, and start building up the PSOS to be a great alternative to iOS and Android for the gaming community.

A PS Phone that ran on the same chipset and OS as the PS4, and could tie in to Sonys Smartband, Smart Watch, and Smart Ear technologies would be completely amazing. I would love to be able to take pictures or video with the new 960fps CMOS chips Sony is putting in the Xperia XZ on a PS Phone, and be able to edit it in Share Factory, and be able to upload it to PSN and my Play Memories photo album.

I almost think they have to do this to solidify the PlayStation ecosystem for the future, and stay competetive with Microsoft, Google, Apple, and maybe even Samsung. It is all about consumer engagement, and ultimately they should want users connected to PSN whether they are at home or on the go, playing games or surfing the web, watching tv or checking/posting to social media, making videos with friends or watching a movie.

In another reality, Sony could have combined their mobile and gaming divisions to make phones with Joycon-like add-ons and a library of exclusive 1st party games (to incentivize not buying inevitable imitations).

Unless Sony manages to fit a PS4 on a portable devide, there is no real chance or interest in Sony to go back to the handheld market. Why try that when they can consolidate their position as the console kings? Leave handhelds to Nintendo and mobile gaming.

nVidia's Volta-based Tegra should be "close enough" to an Xbox One in ideal scenario's that play to nVidia's hardware strengths.
And that is still built at 16nm Finfet.

The Switch is using a chip based around Maxwell at 20nm, if Nintendo opted for a Pascal based Tegra chip, Nintendo could have achieved 50% or more performance for the same amount of power.

At 7nm using a newer and more efficient GPU architecture, aka Volta's successor, performance that is "Close enough" to the Playstation 4 in most of the important metrics should not be a problem. (Things like Bandwidth will probably still come up short of course.)

The issue with taking an Xbox One or Playstation 4 SoC and using it's power characteristics in some kind of guestimation for mobile power consumption/performance metrics is highly inaccurate. It's chalk and cheese. So please don't do it.

For one the Xbox One and Playstation 4 has an AMD CPU, AMD CPU's tend to be slow, hot and generally inefficient, especially Pre-Ryzen, that's compounded by the fact that Jaguar is also old at 4 years and being an evolutionary successor to bobcat... It's not lighting anyone's fires, it wasn't even a fast CPU on it's release.

It's also using a Graphics Core Next 1.0 GPU. Which is also slow and inefficient and doesn't using newer technology's that save on processing power and bandwidth when rendering games... And next to more modern GPU's is simply terrible outside of Asynchronous Compute, keep in mind that Graphics Core Next 1.0 is 5 years old, it's ancient, GPU's have come a long way since then.

For a "Playstation Portable 3" I would expect nothing less than something that is Volta powered, 8GB LPDDR4 memory and a bunch of ARM cores with a full 1080P screen.
I would prefer for the PSP 3 to use Volta's successor, 8GB LPDDR4 memory and a 1440P screen though. Which should be doable in 2018.

Remember, the Switch was underpowered before it was released... In a year or two, your hardware expectations need to be higher.

I'm not a huge handheld fan because I so prefer playing on a big screen, but both the PSP and VITA has been a rock for JRPGs. I have my PSP connected to the TV via component cables, and I game VITA games with the PSTV. A lot of great games. In my book, PSP was a huge success. This VITA would have flourished if it weren't for the proprietary memory cards.

I don't think Sony will do another portable, unless they are way more stubborn than predicted. The only scenarios I see it happen would be:
- AMD manages to redesign the PS4 APU to fit a tablet form-factor and they create a portable, digital-only, PS4. It would already have a huge library and tons of games. I don't know if they could do it, since current PS4 Slim uses 100w and a tablet SoC must be at 10w tops. End of the gen, maybe? That's usually when smartphones start to catch up consoles.
- An Android device, like Xperia Play. But instead of using Xperia branding, it would be designed by SCEE and would be purely PS branded.

Anyway, I don't think any of these cases will happen. Probably VR is now their "second" platform and that's were they will expend their research money.

It's not needed. Why keep butting heads with Nintendo? PSP was a success, but Sony doesn't really have the fan favorite franchises that resonate with all ages to make people go head-over-heels to buy a handheld for them. I don't see them being able to recapture a share of that market in a mobile world.