As someone that played every AA (That were localized, thanks capcom), I think they can do another DR game without problems
The difference with AA, though, is that it admittedly allows for a way broader scope of mysteries because of its more open-ended nature. It's pretty much limitless, and doesn't even need to be limited to murder cases, really, which they've dabbled with a bit.
The nature of a killing game with a small cast and an isolated location limits things. I do still think they could achieve a lot more if they really wanted to, though. But then we've got Kodaka saying stuff like Junko needs to be the villain all the time, or this everlasting war between hope and despair, and I dunno.
I like how, in V3, the mastermind was actually part of the cast for once and not an outsider.
The more i think about it the more i dislike it, cmon, so everything that was told was a lie, miu didn't suffer any accident, maki didn't watch her friend die... the characters and the world is almost pointless, it is pretty much "was a dream" story, at least in dr2 all that happen to the characters life REALLY happen, well i guess not anymore since all the fiction thing but yeah... why should anyone care about any of this caracters if they don't really exist outside the dr world.
The thing is, the characters
are real people. Everything they're going through in fiction are real people who have had their memories transplanted and have suffered or enjoyed fake memories. It's The Matrix, which they actually explicitly cite earlier in the story (and Tsumugi is the one who expresses her enthusiasm for it). The fates of the real life counterparts who die in the fiction are ambiguous, with an interpretation that they die in real life.
So, despite my hang-ups, there are meaningful implications for the fiction towards the series' "real life."