I can say with 100% conviction that the Borg can never scrap these 3 harmful policies.
1) blood policy
2) shunning policy
3) two witnesses rule
Should the Borg remove any of these three completely,,,, the Borg collapses in unto itself.
The shunning policy,,we might see a 'softening' of the stance. Like only 'greeting' people. The shunning policy is the Borgs "teeth" or "bite" in a way to control people.
When it comes to their failed prophecies,, they can just erase things and claim "we never said that".
Thats why its so vital for people to retain old literature. ie) the Finished Mystery.
There was a directive a few years ago for people to return "old literature" to the KHs. To be destroyed,, because they got caught.