With the awesome upgrade coming to Artifacts I feel like this exotic would be made extremely pointless and to be quite frank it wouldn't even be an exotic. Assuming the Artifact abilities we saw don't change then the Memory of Gheleon, a legendary Artifact, would make the Knucklehead radar obsolete. I'm aware of other artifacts that cover some exotic perks but I'm focusing on Knucklehead due to it already hardly being used.
Memory of Gheleon (Legendary):
Provides a detailed Radar (Similar to the radar you get with Keen scout but without marking targets)
Allows you to ADS with all primaries
Knucklehead Radar (Exotic):
Allows you to ADS with all primaries
As you can see Knucklehead would just seem stupid to use. The Artifact provide a better version of this exotic perk, without the need of using an exotic slot.
[b]Idea[/b] for a Buff:
Knuckle Head Radar allows you to mark enemies you damage (Keen scout marking)
I don't really use this exotic but with these badass artifacts coming I probably will never even see this exotic again so I thought it'd be good to give it a bit of a buff to keep it from disappearing. [b]Feel free to give other ideas of how to buff it and if you think we should leave it then give a reason as to why.[/b]
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Perhaps Knucklehead also gives you advanced radar? But the "mark your target" seems understandable as well.