It certainly *could* succeed. I wouldn't bet on it though.

It seems to me that only Nintendo (sometimes) has the magic touch necessary to make something like the Switch work. They're also the only ones with the balls big enough to try, as near as I can tell.

No. They don't have the IP to push a mobile device with.

Except a handheld like that will cost 450$ or 500$ at least

This way include 450$ - 500$ price and 1.5 hours at best for battery life

It would depend on how they handle it. If they properly support it and not make some proprietary memory cards like the Vita, it could do well.

Yeah, vita have a lot of games

Need a franchise can sell system. Nintendo have this for GBA,DS,3DS. This franchise is what save GBA. Sony will have to need something like Pokemon

The industry on a whole can only support so many development environments. There is a limit to resources, and that includes Sony's own in-house capacity to support another platform.

Nintendo's mobile and home strategy all reside under one roof and they have a 10 million unit head start.

Sony would be smarter to sit this one out, because getting thrashed by Nintendo and eating billions in losses would hurt PS4 and PS5 and drag the entire organization down.

It would fail IMO. Nintendo would fight them tooth and nail and Sony doesn't have access to some magical, secret technology. Anything they can get, Nvidia can give Nintendo an equal or better chip.

If PS has any chance of creating a portable/hybrid that plays console games, their best chance is explained in this article.

https://www.kitguru.net/components/cpu/anton-shilov/amd-delays-introduction-of-k12-based-processors-to-2017/

It talks about AMD's x86 Zen and ARM K12 processors being developed together with high compatibility. It also mentions a potential K12 APU, with two cores and a 'next gen' GCN arch (Vega?). The biggest thing is that this APU is supposed to be around 02w TDP, which is insanely low. If this is true it may not be all that impossible for PS to do it from a hardware standpoint. If the compatibility is there, then software shouldn't be too much of an issue either. I've been waiting to hear more about K12 after AMD went dark with it right around the time that Ryzen launched. Most recent articles I can find say K12 was supposed to launch sometime in 2017, but AMD seems to be keeping quiet.

If PS could create a PS5 portable/hybrid using K12 and have PS5 using Ryzen, with both using future Radeon GPU tech, it could work. Not to mention if they could achieve PS4 BC for all PS5 hardware.