I assume that once they have PS cloud gaming Android client, maybe in a year or two from now, they'll release it for PS Portal, and will release there their mobile games to be playable natively too. Around that time Sony would release their own PC PSN store and PC launcher.
Then for the next gen, maybe 2-3 years after the PS6 release Sony could release their own PC handheld if prices go down, which would be the next gen PS Portal, which would run their PC games (cross-buy/cross-play/cross-save with the ones bought in their PC PSN store), their mobile games (cross-buy/cross-play/cross-save with the ones downloaded from their upcoming PSN mobile store) via Android emulation and would have hardware more optimized for remote play and cloud gaming.
Imagine a PS Portal shaped Steamdeck with a decent (for portable console standards, max $349) capable to run all Sony current and future PC games natively at 1080p 60fps with decent settings, which with some next gen DLSS/FSR like upscaling method would be scaled to 4K (it would have tv out and an OLED 4K HDR display). It would have the latest wifi tech available at the time and maybe even an optional 5G card.
Its raw horsepower would be somewhere between PS4 Pro and PS5 but thanks to next gen RT and RTGI plus supersampling and smaller screen would look almost like a portable PS5. Which will be fine because most next gen games will be crossgen between PS5 and PS6.