I think an "adult" JRPG would be boring. I mean real "adult" stuff, not just more violent and darker versions of boys' adventure fantasy. Real adults have to contend with such things as employment, taxes, marriages, relationships, law, crime, property, finances, family duties, etc. --not demons and mecha and dreamlands or anything fun and colorful. So no, I don't think they should make more adult games. They should just do what they're already doing, but add more blood, violence, serial killers, grimdark, anti-heroes, 'serius bzness,' Hollywood tropes, etc. That's gotta work for the super mature adult gamerz of today, right?