The point of a hybrid Console is that it'd fuse together the the home console and handheld development teams to work on one device and provide regular content without splitting the fanbase across multiple devices (since Ninty never had tremendous 3rd party support this was always a serious issue on their devices). Sony already did that by focusing all of their resources on the PS4 and I doubt they'd want to stop their dick measuring contest with Xbox just to win over some Nintendo players. Not to mention such device would lose Blueray & DVD functionality which is still a big selling point in favor of the Xbox and PS4 despite not being marketed very much.
I also doubt even Sony fans would buy a Vita successor. A lot of people felt betrayed by Sony in the way they treated the Vita You just need to look at some 1yo r/vita threads.
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