Why is going back to konoha unrealistic? He hasn't even done anything really to konoha, has he?
He killed Danzo, Itachi - most people in konoha probably celebrated
He attacked naruto at valley of end - most people probably didnt care about that
He helped save konoha from gaara
Apart from being a missing nin and joining akatsuki and messing with other people's villages, i can't really see why he can't be accepted back into konoha. If i was a konoha citizen, the guy could become hokage for all i care
as u mentioned :
1:He went rouge not missing (nd rouge ninjas should be hunted down by their respective village that is the ninja law )
2:Joining akatsuki which is the crime considered in whole 5 nations
3: nd tried to kill the jinchuriki (an ultimate military weapon) which is equal to opposing whole cloud village
4: Attacking the 5 nations negotion meeting.
This crimes alone makes him an high level criminal .
nd u r not looking from the villagers perspective if u r saying
"If i was a konoha citizen, the guy could become hokage" villagers do not know danzou being criminal, for villagers their kage is killed .