Skullwaker on 15 July 2015
I love Digimon, but it's certainly not a killer app. At least not right now. The anime is just now getting revamped, but it's not in its prime as it was with the original Adventure series. It's also not extremely popular as a game series, and even though Cyber Sleuth sold fairly well on the Vita, it was still a far cry from Pokemon and multiple other games on the system sold significantly better.
I think it would take years and years to build up the Digimon brand to that level, and by then Sony might not even make handhelds anymore.
