I agree that it would be really cool to bring infamy back, but if rebels get a special talent tree equivalent to the honor system, then it will make rebels vs bounty hunters even more unbalanced. I think we also need stuff added to BH to keep it balanced, because this would make rebel objectively better.
Infamy could replace war rating
Some of the top level perks could be to purchase rare and currently unobtainable stuff, like:
Shotgun pellets
RPK
Zafir
Obviously this stuff would have to be really expensive, but being able to purchase this stuff from a store would be cool if it's balanced.