Ok, lets check some games and genres on Ps3:
Action/adventure: Uncharted,Assassin's Creed,Infamous,Mgs4 etc.
FPS:Killzone2,Call of duty,Resistance,Bioshock,Battlefield etc.
Platformers:Trine,LittleBigPlanet,Ratchet and Clank,Braid etc.
Racing:Burnout,GT5P,Motorstorm,Wipeout etc.
Sports:Ea games etc.
RPG:Demon's Souls (its more Rpg than Jprg),Dragon Age, Oblivion,Fallout 3,VC etc.
Fighting games:Tekken6,SV4,SC4 etc.
JPRG:Eternal Sonata,Wck coming.
Now, as you can see Ps3 has no succesful Jprg:s (Vc is more Strategy/RPG than Jprg).So if person haven't bought Ps3 for games above, its because there haven't been Jprg:s on Ps3.So when Final Fantasy XIII comes, and if its any good, people will have all games they can dream on Ps3.Nothing is missing.
But what I find interesting, is Japan. It has had those Jprg:s they so much want, and series like Res,Mgs and Yakuza but still haven't managed to dominate in Japan.
GT5 might also be most important title for this year, since those racing games haven't been that great for some racing fans.
Take my love, take my land..