Well, when every single Japanese focused launch title is available on the system's predecessor, it's difficult to convince your audience to upgrade.
In reality, it's Sony's responsibility to convince Japanese publishers to move to the PS4 in order for it to become a healthy platform in its home market.
With all the major jrpgs besides FF and KH being announced on the PS3 and not the PS4. The PS4 is going struggle for quite some time.
All I can say is, Sony better has something to show which appeals to the local market soon. Once MGS GZ is out, the remaining release schedule looks so depressingly barren.