This is pure speculation ..but does anyone think that the PS3's lack of any jRPGs (compared to the 360) be a draw for Atlus? The PS3 has very few jRPGs so any RPG fan would probably be starving for a good one (last jRPG was VC right?), whereas on 360 you have lots of mediocre/decent jRPGs, not gonna bother listing them, so when a casual RPG fan walks into gamestop or searches for RPGs on Amazon they see a fairly big list, someone whose never heard of Megaten games isn't going to go for that over SO4, if they want a RPG fix.
This lack of any competition, except for FFXIII (and if anyone at Atlus has a brain stem they would stay at least 6 months away from that beast), people who've bought that will probably want another RPG (FFXIII may bring a bunch of casual gamers onto the platform) they will probably only find maybe 3-4 others.
This could give them a reason to say "ugh, why do they have no RPGs" but also gives them a chance to see Persona 5 and maybe become interested in it from never hearing about it before. This is what happened to me back in 2007 when there were literally no RPGs coming out, since I wanted (needed?) to play one I went on gametrailers and started looking at random ones, after watching the P3 trailer I was completely sold on the art style, music, and the dating sim/dungeon crawling aspect of it.
Two years later, I have P3, P3FES, P4, DDS 1+2, have Persona PSP on preorder, and probably picking up Nocturne in the near future.