Comment by Narishma

> Sony's Vita was quite successful with titles like Killzone Mercenary which was as fun a shooter as you'll find on any platform, but Sony gave up on the form factor because of the phone fever sweeping the world.

I think they gave up on it when they realized they didn't have the resources to support both a console and a handheld with the rising costs of game development. Nintendo faced the same issue but they got rid of their console instead and designed their handheld to be able to be docked in order to get similar functionality.