The trouble that I can imagine with that approach is that it would be more expensive to manufacture than the PS4Pro.
So that would set Sony out to compete with Nintendo in the high priced portable space, with a more expensive console. Better performance, but the X1X is proving that a performance gulf doesn't matter.
Given that we've seen the higher spec Raven Ridge APU target a 15W TDP with 10CU's at 14nm, I can imagine OG PS4 level performance should be possible within the next few years, at a reasonable price, within a sensible tablet/laptop total TDP. They'll be able to release that at a time when Nintendo has already blown its Zelda/Mario/Mario Kart/Pokémon/Super Smash Bros loads, meaning they won't be in such an unassailable position as they are now.
That being said, I think it would make more sense for them to use a stripped back PS5 instead of a downclocked Pro:
- The only viable AMD CPU for a PS4 Portable is Zen, which is what we're likely to see in the PS5.
- If the PS5 uses some form of HBM, it's better suited for portable use than GDDR6, and offers more bandwidth than any LPDDR.
- If the PS5 requires PS4 games to go through some sort of conversion process in order to play, then Sony would already have conversion tools at the ready, well developed, and with most PS4 games already done. "Plays 85% of PS4 games, all high profile games" at the launch of the PS5, followed a year or two later by "plays 95% of PS4 games, even Life of the Black Tiger" come the launch of the PS4 Portable, seems like the easiest message to sell to the public.
But that's years away, and I think a cheaper alternative to the Switch would be something they could cobble together quickly, and could be enough to scratch the portable itch of a few million PS4 gamers.
As the Vita was faltering, Sony began to market it mostly as a PS4 accessory. The trouble was that it was quite bad at it. So, I say, there's room for a well suited PS4 accessory... and people could always do with an extra controller.
~2-4GB of LPDDR4 memory paired with a low/mid-range SoC, inside a slightly enlarged DualShock 4, with a 540p screen, for a $150 RRP would be perfect as long as they got the OS and interoperability right.
- Worse performance than the Switch, but if you want great performance, load it up on your PS4/Pro, because every portable game would be compatible with the PS4 and above, with enhanced graphics.
- If the PS4 can emulate it with under half or a quarter of its resources, any portable game can be splitscreen multiplayer on the PS4/Pro.
- For over 70 million PS4 owners: spend ~$80 on a DualShock 4, or $150 on one that also plays games on its own. Also, buy into a whole new console and ecosystem with the Switch for $250 if you want portability, or stay with your current platform for $150.