To be fair, Sony is beginning to go in that direction.
I think Vita was a stop-gap measure, as they knew that they could release one more 3DS competitor and make some money on it, before going full-on with Android-based gaming. At GDC, they more or less hinted at it in regards to online PSVita games - that they are releasing new kits for Playstation-based games on Android.
I think in 4-5 years, Sony will totally transition to that format, using the PSVita as a jump off point.
Back from the dead, I'm afraid.