I'd like to see something like that happen just so Lucas would get a little whiff of how it feels like when somebody takes the thing you thought was perfect and redoes it, and announces it as The New Definitive Version of It.
Other than that... I don't think JJ will be able to match any of the fan edits. He may alter certain scenes that might later come in handy for faneditors, but... yeah, other than that - I'm not really interested in anything like that.