I don't know... I can't see Persona 4 on anything but the PS2.
Not to many Persona fans have HD consoles i'd say... just by the numbers alone.
As for the Wii.. as great of games as they are i'm not sure Nintendo would want Persona on their systems. Shin Megami Tensei games are pretty controversial... or would be if anyone outside of the gaming media paid any attention to them.
In the last game you had teenagers summoning daemons by shooting themselves in the heads.
A system shouldn't be put to bed until every developer feels it can't make anymore good games on it.
It's not up to Sony or anyone else to kill the PS2 except for the next gen systems.
That's the real "problem". Aside from looking a lot nicer none of the next gen systems have done anything to surpass the PS2.
Well sure the Wii inovated, but that's not for everybody... and motion controls just don't work for some games like Persona... which might want to lay low until the press stops before getting on the Wii.