I do not think she should publish these stories.  There is something mythical about them that would be lost in mass-produced paperback copies.  It is a little like the pot of gold at the end of the rainbow; of course you know it isn't real, but the idea of it adds magic to a rainbow.  The idea of these seven leather-bound books somewhere in the world in JKR's own writing, to be passed down only to the owner's descendants, adds the type of mystery to her existing books that the actual