Well, even if the story of a P4A2 wasn't some Eternal Punishment or Continuum Shift situation, they could still decide to have the Investigation Team wear their school uniforms again and then there'd only be sprite recolorings and really minor modifications (like changing), which wouldn't be that difficult to implement.Yosuke and Kanji's hair
I think there won't be a P4A2 for a while just because both companies are so busy with their other projects. When a (fighting) game had a really good critical reception and when the (Japanese) sales were fantastic, I don't think you just leave it be with no sequel.
This is an exaggeration. Didn't it sell something like 200k total? That's good, but not fantastic. Puts it up to like 250k worldwide.