Sony isn't capable of supporting more than one gaming ecosystem at once, we saw this with the Vita. If they made the "PS Switch" their only console (so a PS$ successor) then it could work.

PS4 pro specs on a vita-like handheld with a docking station. seems not doable in the near future. so I doubt it.
PS4 caters to a demographic that requires great graphics and most of the gamers would play on the TV. Otherwise, Japanese gamers wanted handhelds hence Sony would love that idea but hard to get a PS4 pro specs/level on a handheld so won't happen soon.

When the psp4 comes into the market at $250 the Switch will already be at that price point.

Except you need a memory card required for Vita so it is 300$, not 250$ and in fact, Vita at best = early ps3. The most advantage mobile chip these days is not close to ps4 yet, let alone ps5. Also, outside Nvidia, which company can provide Sony a mobile chip for a hybrid that is stronger than Switch and can play ps4/ps5 games with 250$ price point and battery life last at least 3 hours?

When psp4 happen, Switch maybe cost 200$ only and it will be a long wait for ps4/ps5 power on handheld

They could I just don't want them to. I don't want Sony copying Nintendo's idea.

Just wanted to make another statement on my favorite topic.

Ways I see Sony failing at this:

-Build a PlayStation Switch the is seperate from the main line console. (Ex. PS4 or PS5 uses X86, PS Switch uses ARM. PS Switch has own games/OS.)

-PlayStation Switch Clone is PlayStation 5 (I don't see portability being more important than 4K and VR with the core PS userbase, this would go against everything the PS4 is.)

-Sony fails to offer 4G or 5G, limiting the capability to take advantage of PSN, and larger market functions like calling and texting.

-They try and shoehorn it in with Xperia and Android. 

Ways I see Sony having an oppertunity to succeed:

-Built as another piece of the PlayStation Ecosystem. (Uses PS4 or PS4 chipset. Shares the PS4 or PS5 OS. Shares all software and services with PS4 and PS5.)

-Built with mobile in mind. (Offer a 4G or 5G model, allowing it to stand alone as a mobile streaming device, mobile online gaming platform, and cell phone replacemennt.)

-Built with the gamers in mind. (Offer a Wifi only model for a very affordable price for those that purly want it for gaming.)

I would love to see them build a PS Switch, PSP3, PS4 Phone, etc. by 2019 on a 7nm PS4 chipset. AMD already has APU's with massive CPU improvements over PS4, with just shy of PS4 GPU power that are running at 15 Watts on 14nm fabrication. 

Alternatively, and maybe even more plausable. They could do very well with PS5 in 2019 offering a Wifi PS5 Handheld, 4G PS5 Phone, a base PS5 Console, and a Premium tier PS5 console. 

If they went the PS5 route, they could have the entire PS4 library B/C on all PS5 devices. PS5 games could be built to scale from 720p on the Handheld and Phone, with 1080p or 1440p on the base PS5, and 4K in the Premium unit. 

At any rate, I believe Sony has to expand the PlayStation ecosystem to more form factors, and continue to push for a broader market. Either they do it under the PS4 and establish themselves in the mobile space before moving to PS5, or they do it with the launch of the PS5, offering more ways to play, and greater value than ever.

Well I personally wouldn't expect the handheld/hybrid to be the exact same specs as the PS4. The spec would matter more in terms of what the PS5 console specs were, since it would be in the PS5 family, but hopefully the handheld/hybrid would be able to play PS4 games.

Saying AMD can't do what Nvidia can do is something you can only base on what's presently on the market at the moment. Based on the article it seems AMD may have something competitive with the Tegra line, but maybe they don't, and maybe that's why they have been so quiet about it, in which case a hybrid/handheld PS4/PS5 may be more unlikely.

The article doesn't give much info, but even with a low core count (and not many CU's?), it says it's only 02w TDP, and since Tegra is in the range of 15w TDP, that K12 APU should be able to be beefed up quite a bit to hit 15w. Even the low end Ryzen mobile APU chips are in the 15w range and are really impressive in how well they can handle games. Like not that far from PS4 impressive. At 720p they should play perfectly on a PS handheld/hybrid. I don't see how a $300 PS "Switch" isn't possible in the next year or two, assuming they already have something preliminary they can work off of, on top of seeing Switch's design and success.

[Depends on many things] For a "playstation switch" console to be successful it need games, cause games sell consoles, and it needs to be advertise really good. I've never seen a Vita commercial on TV yet!

This is what has me very excited, and makes me think they will be able to pull this off on X86.  The Ryzen 7 2700U already has the CPU power to run circles around PS4, and it has more GPU power than the XBO, and this at 15watts on 14nm FinFET. Going to 7nm FinFET, which should be available in 2019, there is a very real possability of a PS4 Portable or a PS5 Line of devices that includes a Portable. At any rate there will be more than enough power to run PS4 games, and keep the power window under 10Watts, using X86 which is ideal for compatibility and work load. I really hope something is in the works, and Sony killed off Vita support in anticipation of unifying their home and mobile offerings under one architecture, one OS.