They could have waited and then released it as a PS4 launch game, but that's just me.
Release a new IP with little hype on a system with 80 million or release it on a system with 8 million? Naughty Dog isn't a charaity you know. Making something a launch exclusuive is saying well I don't care how well it sells.
In this day and age, with the Internet, ignorance is a choice! And they're still choosing Ignorance! - Dr. Filthy Frank