The biggest problem I see is for groups (such as mine) where we trade off who is gm.
I can create a nice campaign template with multiple characters all set up with macros... But from what I can tell, I can't share a copy of this campaign with a friend.
So best case is we could co-gm and re-use a campaign template. That still doesn't help when we only want a single person as gm and that person changes from time to time.
Importing and exporting characters to different campaigns would be really nice.