I think they'd be better off going software only for their next handhelds. Use the Playstation App to not only connect your PSN ID but to download dedicated mobile Playstation titles with Trophies and all the features you expect from PSN. Kind of like a mobile Steam but specifically with Playstation connection in mind.
Also, have a compact controller peripheral that automatically gets bundled with all high-end Xperia phones and tablets and can clip/slide on with ease. All Playstation mobile titles should support this peripheral. There should also be crossover between PS3/PS4 titles.








