It's a software platform, like Java or Flash. If it proves popular, Sony will have a massive ecosystem built around their technology. They can create their excellent 1st party titles and release them not only to the PS install base, but the many-times-larger Android install base too. And in doing so they add value to their PS platform, where a potential console buyer can see buying a PS allows them to play their existing mobile games on the big screen. And they can also license the PS brand and gain revenues from other people's hardware. It's exactly the same as MS releasing Windows on console, PC and phone, with a unified Live! network, only for Sony it's platform independent. Same as Music and Movie Unlimited but for games.Why would Sony allow it on non Sony products?. If it's not a differentiator what's the point?
It's one of the few clever moves of Sony in recent years where they've let their network fall by the wayside. It may not work, but at least it's a forward thinking, aggressive strategy.