No RPG can really afford to be exclusive these days... SO4 won't be on the 360 for more than 6 mos before a PS3 version is announced.
RPG sales are just not good enough to justify exclusivity... and in response to the OP, no RPG really has great potential on the PS360, with the possible exception of FF XIII.
Yes SO4 will bomb if it is forever exclusive to the 360, as ever other exclusive JRPG (not to be confused with WRPGs like Fable II and Oblivion) on either the PS3 or 360 has. It will perform on average if its a cross platform title.







