So we've seen MJ several issues now in the Brand New Day world -- there was the Paper Doll arc, and now this. We don't know why she and Peter split up, but we do know that MJ is:
- a nice person who cares about her friends - not perfect, but honest about her mistakes - lacking superpowers but still able to help take down superpowered villains - observant
... So who, at this point, would rather read a comic about MJ than Peter?