boruto follows a darker path- pretty predictable, and following in sasuke's footsteps.
role of hokage abolished- that wouldn't be interesting, actually. Cause people don't watch Naruto/Boruto to see someone act as the hokage.Whether someone is hokage or not, it ain't gonna change the fact that people watch to see a good plot and great action.
a major good guy is secretly kara- I don't know, depends on how things play out.Either way, it'd be the same thing as betrayal.
Orochimaru- major villian...he's irrelevant.
A lot of these choices you've come up with seem based off of things that have been "hinted" in the manga already.These aren't original outcomes...