Oh man, if John were to come back now, there would be so much to explore. The boys have changed and learned so much since he died. If you ever write something like that, I'd love to read it!

What else's on the list?
Music! S8 and 9 seem to be working on including more music into the show, but S6 and 7 were really terrible on that front. And better VFX. I can tell that a LOT of the VFX on the show is not going to age well, unfortunately :S