Sony believes there is no handheld gaming market since the faillure of the PlayStation Vita outside of Japan but they are wrong,

The PlayStation Vita is the exception not the rule, the Playstation 4 is doing very great but a PlayStation Portable have a lot more potential, the market of the PlayStation 4 is limited because of the lack of portability.

Sony needs to face the reality, the PlayStation Vita was a faillure but it would be just wrong to underestimate the market.